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Sperm Health

Revolution

Macalibrium®

Regular price $39.99 USD
Regular price Sale price $39.99 USD
Sale Out of Stock
60 Day Supply

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Revolution Macalibrium® supports male fertility and the body’s natural hormone and testosterone production. As shown in published case reports, it helps optimize a man’s sperm motility by up to 7900%, moving sperm by up to 3456%, sperm morphology by up to 75% and sperm count by up to 48%, when used within a clinical protocol to support hormones and overall health¹.

Shipping & Returns

We know how important it is to get your order quickly, so we offer a variety of shipping options to suit your needs!

For U.S. Orders:

  • Free Shipping: Enjoy free shipping on all U.S. orders over $75, as well as all Subscribe & Save orders.
  • Standard Shipping: Expect your order to arrive within 2 to 5 business days. We’ll do our best to get your order to you as quickly as possible!
  • Expedited Shipping: Need your order faster? With expedited shipping, you can expect delivery within 2 business days from the time your order is processed.

Please Note:

  • Orders placed over the weekend or on a national holiday will be processed on the next business day.
  • While we work hard to get your order out on time, please be aware that we’re not responsible for any shipping carrier delays once the package leaves our hands.

We’re here to ensure a smooth and hassle-free experience! If you have any questions about your order, feel free to reach out to us at customer.service@symphonynaturalhealth.com

Returns, Exchanges and Refund Policy

At Symphony Natural Health, our top priority is ensuring you get the results you’re looking for. If for any reason you need to return or exchange a product, we’re here to help! Please review our policy below.

Returns for Unopened, Unused Product

We want you to feel great about your order! That’s why we offer a 30-day return policy from the day you receive your order, for any order or item you need to return that is unopened, unused, and in its original packaging. Don’t forget to keep your proof of purchase handy!

Starting Your Return:
It’s easy-just reach out to us at customer.service@symphonynaturalhealth.com or give us a call at 415-243-9991. We’ll guide you step by step through the return process. Please note that we cannot accept items returned without first contacting us, so be sure to reach out!

Damaged or Incorrect Items

How annoying! We’re really sorry about this! Mistakes happen, and sometimes things go wrong during shipping, but we are here to make it right. If your item arrived damaged, defective, or if it’s not what you ordered, contact us right away at customer.service@symphonynaturalhealth.com or call 415-243-9991. We’ll make it right as quickly as possible!

Exchanges

Ordered the wrong item and want to swap for the right one? No worries! We’re happy to help with exchanges—just get in touch with us at customer.service@symphonynaturalhealth.com or call 415-243-9991, and we’ll take care of it.

Refunds for Opened or Used Products

If you’ve already opened or used your product and feel it’s not working as expected, we’re here to help! Our goal is to ensure you get the best possible results.

Our Medical Team is available 7 days a week to provide personalized support. With over 17 years of experience, we’ve found that small adjustments—like tweaking your dosage or improving hydration—can make all the difference.

Many people see great results using our products on their own, but with personalized guidance, outcomes can be even better. That’s why we’re so committed to offering this support—because when you have the right information and expert insight, you’re more likely to achieve the results you’re looking for. This level of care is what sets us apart.

And if, after following our Medical Team’s guidance, you’re still not seeing the results you hoped for, we’ll gladly issue you a full refund.

When you feel your best, you become part of the Symphony Natural Health family—and that’s what truly matters to us.

You can reach them 7 days a week at medical.team@symphonynaturalhealth.com. We’re here to help!

Refund Policy Details

  • Shipping Costs: If your order didn’t qualify for free shipping, we’ll refund the product price, but shipping costs are non-refundable and a restocking fee of $9.99 may apply.
  • Unopened and Unused Products: For returns of unopened and unused products within 30 days, simply contact our Customer Care Team at customer.service@symphonynaturalhealth.com
  • Returns Outside the 30-Day Window: These returns will be handled on a case-by-case basis, at the discretion of our Customer Care Manager.

Opened Products: Returns for opened products will be managed by our Medical Team to ensure you receive the best possible guidance on using the product.

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What is most important to you?

HOW IT WORKS

Nearly 50% of infertility cases are due to male factors, but most men don’t realize their hormone and sperm health could be part of the issue². If you’re planning to conceive, optimizing sperm health early can make all the difference.

Modern stress, poor sleep, diet and exposure to environmental toxins can disrupt the hormone system responsible for sperm production, even before any symptoms show up³. This can affect:

  • Motility - How well sperm move 
  • Total Motile - How many moving sperm you have overall 
  • Morphology - Sperm shape and structure
  • Concentration - How many sperm you produce 


One of the major factors in sperm health is hormones. In fact, sperm health is impacted not just by testosterone, but also⁴,⁵: 

  • Follicle-stimulating hormone (FSH), which helps stimulate sperm production 
  • Luteinizing hormone (LH), which signals the testes to make testosterone
  • Gonadotropin hormone-releasing hormone (GnRH), which stimulates LH and FSH release
  • Prolactin, which can interfere with the hypothalamus, pituitary, adrenals, and testes (HPAT) axis when high
  • Growth hormone, which supports sperm production and sexual function 

This hormone symphony is controlled by the hypothalamus, pituitary, adrenals, and testes (HPAT axis), the network that regulates hormone production in the body.

Revolution Macalibrium® works directly to support the HPAT axis and hormone balance in the body, which in turn has a direct impact on sperm health.*

DIRECTIONS FOR USE

  • Initial Dose for Fertility Support: While the standard dose is one capsule twice daily, we recommend that most men, unless sensitive to supplements, start on two capsules twice daily for the first 2-4 weeks. This dosing regimen will invigorate the endocrine system to allow them to feel the full effects of Revolution Macalibrium®. It also gives men a baseline to compare to when they go on the standard dose, should they need to stay on the higher dose for a more extended period. As an aside, two capsules twice daily for some men will be too much, but they will notice that quickly by a feeling of overstimulation and can reduce to the standard dose immediately. Our Medical Team is available at no cost to help personalize your dosage based on your individual needs.
  • Standard Dose: 1 capsule twice daily.

  • When to Take Revolution Macalibrium®: For the best results, it is recommended that you take Revolution Macalibrium® twice daily. The first dose is in the morning, with 8-16 oz. of water away from food, ideally before breakfast. The second dose in the afternoon 30-60 minutes before you normally have an energy low. Do not take after 3 PM as it may impact sleep.
  • Results Timing: Supporting reproductive health follows the body’s natural rhythm. Since sperm take 3-4 months to fully develop and mature, allow 3-6 months of consistent use to see the full effects, especially when supporting sperm quality and function⁶.*

Clinical Research

In a published case report featuring two patients in the American Journal of Men’s Health, Revolution Macalibrium®, when used in a clinical protocol, supported¹:

  • Sperm motility by 7,900%
  • Total motile sperm by 3,456%
  • Sperm morphology by 75%
  • Sperm concentration by 48%
  • Free testosterone by up to 259%
  • Total testosterone by up to 57%
  • Energy and mood balance*
  • Stress resilience*

Besides fertility, healthy hormone levels in men have been shown in research to support⁷,⁸:

  • Bone health
  • Cognitive function
  • Heart health
  • Immune health
  • Mental health
  • Metabolic health and body composition, including fat and muscle mass
  • Sexual health
  • Stress resilience

Together, these benefits highlight the importance of maintaining healthy hormone levels in men.

Clinical ResearchClinical ResearchClinical ResearchClinical ResearchClinical ResearchClinical Research

REVOLUTION MACALIBRIUM® VS. MACA

You may have noticed that the ingredient in Revolution Macalibrium® is connected to the herb maca. What many people don’t know is that there are up to 17 different types (or phenotypes) of maca which can be different colors, have different DNA, different ingredient profiles and most importantly – have different physiological effects in the body10.

Revolution Macalibrium® is a vegan, organic and highly concentrated blend of specific maca phenotypes formulated to support men’s hormone strength, energy, vitality, sperm and cardiovascular health by optimizing the body’s natural hormones and testosterone production. Its active compounds are up to 10x more concentrated than raw maca and 99% water-soluble, making it highly bioavailable and effective for supporting natural testosterone production and hormone strength.

For example, clinical research on all phenotypes of maca have shown that one type improves fertility in men, while a completely different phenotype improves fertility in women. There are two types of maca that improve prostate health, while all others don’t, and there is even one which can be detrimental to prostate health for men who have preexisting inflammation. 

To the right are two charts comparing the concentration of our products as compared to the highest concentrated extracts we could find on the market – one a 10:1 extract from the US and another a 5:1 extract from Europe.

  • Doctor Approved

    Revolution Macalibrium® is the tool I have been waiting for. Science based, safe and effective at providing a solution for so many of my male patients' andropause issues. It works!

    Joel Kahn, M.D.

    America’s Healthy Heart Doc

    Joel Kahn, M.D.

Quality has been at the heart of all that we do at Symphony Natural Health, since our founding in 1997. We started as a raw material supplier, providing hundreds of tons of herbs from Vanuatu, Australia and France to some of the biggest herbal extraction companies in the world.  Over the next several decades, we’ve grown into a fully vertically integrated company, controlling every step of the process—from seed to shelf. With our own farms, manufacturing, packaging, and fulfillment centers spanning seven countries, we believe that producing the highest-quality products isn’t just about getting one thing right—it’s about getting everything right.

ATTENTION TO DETAIL

Our process begins with researching each plant's unique biology and chemistry, to identify the key biomarkers that deliver real benefits. From there, we carefully select the best   varieties or phenotypes and find the ideal growing conditions—whether that’s soil, climate, or elevation—to ensure the potency of every plant. We also test the soil for heavy metals, pesticides and other potential contaminants to ensure our products are as clean and safe as possible.  When harvest time arrives, we assess the optimal time of the season, time of the day (diurnal cycle), plant growth stage and harvest method to maximize the active ingredients in the plant.

SUSTAINABLE, ORGANIC FARMING PRACTICES

Sustainability isn’t just a buzzword for us—it’s essential to ensure our farms thrive for generations to come. By following the traditional, time-tested practices like crop rotation and soil rejuvenation, we maintain the health of our farms in places like Peru, Vanuatu and France, where crops have been harvested in some cases for thousands of years. We also understand the benefits of organic farming for both higher plant quality and purity; all of our farms are organically certified or in transition to becoming organically certified.

NOVEL, SUPERIOR HARVESTING, DRYING AND MANUFACTURING PROCESSES

Each plant we work with requires a unique harvesting, drying, and manufacturing process to optimize the full spectrum of key active ingredients and bioavailability. These proprietary processes that only use water, temperature, and pressure, result in concentrated levels of active ingredients up to 10 times higher than normal raw materials delivering more potent, bioavailable products without any chemicals or solvents.

100% NATURAL, PURE, VEGAN, KOSHER AND ORGANIC

Every Symphony Natural Health product is certified USDA organic,  Kosher,  and Non-GMO. Our entire line of products are completely vegan and contain no chemicals, solvents, excipients, preservatives, colors, flavors or fillers. You’ll find nothing but pure, organic herbal powder and an organic vegan capsule in every box.  

LOW FODMAP AND FREE OF ALL COMMON ALLERGENS

Symphony products are free from gluten, wheat, yeast, soy, nuts, corn, and dairy, and are third-party verified as low FODMAP—making them safe for those with sensitivities.

PACKAGING FOR MAXIMUM STABILITY AND FRESHNESS

Every detail matters—including how we package our products. Our commitment to wellness, wisdom, and consciousness is reflected in everything we do, from the products we create to the way we deliver them to you.

Just as every transformation begins with a seed, our packaging is as mindful and deliberate as the products themselves. The seed symbolizes infinite potential and growth, and we bring that same care to how we protect your wellness journey.

Our packaging isn’t just functional; it’s an extension of our energy and purpose. With the same mindfulness and intention we put into our products, we use oxygen- and moisture-resistant blister packs, along with UV-shielding boxes, to ensure every capsule remains as fresh and potent as the first. This thoughtful design preserves the quality, effectiveness, and energy of every dose—right up to the very last capsule.

THIRD-PARTY CERTIFICATIONS, TESTING AND QUALITY ASSURANCE

Our manufacturing facilities are GMP and HACCP certified, and every batch is rigorously tested by third-party laboratories to verify its purity, potency, and safety. We also ensure compliance with California’s Proposition 65 for heavy metals. With years of clinical trials, as well as pharmacology and toxicology research, you can trust that Femmenessence is not only effective but held to the highest standards of quality and safety.

Preconception Health

Lay the strongest foundation for fertility, pregnancy and your future child’s wellbeing.

Preconception health is one of the most important, but often overlooked, stages of the fertility journey. Research shows that preparing your body at least four months before trying to conceive can dramatically improve your chances of conception, support a full-term pregnancy, and positively influence your child’s lifelong health.*

Today, challenges like hormone disruption, toxin exposure, and nutrient depletion are more common than ever, but they’re also addressable with the right plan.

  • Revolution Macalibrium® supports natural testosterone production, sperm quality and adrenal balance by nourishing the body’s HPAT (Hypothalamus-Pituitary-Adrenal-Testicular) axis.
  • Femmenessence MacaHarmony® supports hormone balance, regular cycles, and endocrine resilience in women by targeting the HPTAG (Hypothalamus-Pituitary-Thyroid-Adrenal-Gonadal) axis​.

Together, these clinically researched formulas help support:

  • Improved egg and sperm quality
  • Increased natural conception success (including IVF outcomes)
  • Reduced miscarriage risk, from 25% to as low as 3.5% in key studies*

This research is the work of Jan Roberts, a clinical nutritionist, international fertility educator and author of six best-selling books on natural pregnancy, birth and preconception care, including The Natural Way To Better Babies and Healthy Parents, Better Babies. Her work has helped shape modern preconception care by linking nutrition, hormonal balance and environmental detoxification to healthier pregnancy and her globally recognized protocols continue to guide couples and health professionals in preparing the body for the healthiest possible pregnancy.

Learn more in our Whole Health Guide to Preconception Care, an essential guide for the four months before trying to conceive.

Optimize Your Preconception Journey

All-in-One Support

Set yourself and your future family up for success with a complete fertility support system.

The Fertility Preconception Pack combines:

  • Revolution Macalibrium® for sperm quality and male hormone strength
  • Femmenessence MacaHarmony® for female hormone balance and cycle regulation
  • Plus pH Quintessence, 40:1 Alfalfa Concentrate rich in chlorophyll, antioxidants, vitamins, minerals and essential amino acids, to help alkalize the body by balancing pH and supporting detox and the metabolism of hormones*

Everything you need to support conception, naturally.

Bundles & Sets

Symphony Natural Health

Fertility Preconception Pack

Regular price $299.00 USD
Regular price Sale price $299.00 USD
Sale Out of Stock

What Sets Us Apart – Our Medical Team

Your health journey is unique, and the right support matters. With over 200 years of combined experience, our expert Medical Team has guided more than 150,000 individuals. We're here to provide personalized care, ensuring you feel supported and empowered every step of the way. Gain special access to personalized guidance from our Medical Team when you join our community. We're here to help you find the right dose, manage supplement interactions and provide expert advice to optimize your health journey.

Medical Team

Meet our medical team

  • Dr. Deanna Minich

    Ph.D., Nutrition Scientist

  • Dr. Wendy Warner

    Gynecologist

  • Dr. Tori Hudson

    Naturopathic Doctor

  • Dr. Kim Ross

    Doctor of Clinical Nutrition

  • Dr. Mona Fahoum

    Naturopathic Doctor

  • Dr. Corey Schuler

    Nurse Practitioner & Nutritionist

  • Jan Roberts

    Pharmacist & Clinical Nutritionist

  • Dr. Marc Sklar

    Fertility Expert

  • Dr. Catherine Darley

    Naturopathic Doctor

WHAT MAKES OUR MEDICAL TEAM SO SPECIAL

Available at these grocers and wellness centers

New Seasons Market
Mother's Market and Kitchen
Whole Foods Market
Shirlyns Natural Foods
Harmons Grocery

FAQs

What is Revolution Macalibrium®?

Revolution Macalibrium® is a vegan, organic and highly concentrated blend of specific maca phenotypes for men, formulated to support reproductive health and hormone strength. Its active constituents are concentrated up to 10 times higher than raw maca and are nearly 100% water-soluble for optimal bioavailability. In clinical use, the formulation has demonstrated significant improvements in key sperm parameters when taken consistently over time.*

What does Revolution Macalibrium® do for male fertility?

Revolution Macalibrium® supports male fertility by promoting healthy hormone balance and optimizing conditions for sperm production and motility. Nearly 50% of infertility cases are due to male factors, often tied to disruptions in the body’s hormone network from stress, poor sleep, diet or environmental toxins².

Revolution Macalibrium® works with your body’s own system, specifically the HPAT axis (hypothalamus, pituitary, adrenals and testes), to support natural testosterone production and reproductive hormone signals.* This helps optimize:

  • Sperm concentration (how many)
  • Motility (how well they move)
  • Morphology (shape and structure)

In a 2024 case report published in the American Journal of Men’s Health, Revolution Macalibrium® used within a clinical protocol was shown to support a man with fertility issues, including a 7,900% increase in motility, a 48% increase in sperm concentration and a 75% improvement in morphology over six non-consecutive, cumulative months of use¹.*

Rather than adding hormones, which can interfere with fertility, Revolution Macalibrium® supports the body’s own production of hormones, providing foundational support for men who are actively trying or planning to conceive.*

What makes Revolution Macalibrium® different from other maca products?

Most maca products use generic or raw maca without distinguishing between the different types, also known as phenotypes, but not all maca is created equal. There are up to 17 known maca phenotypes, each with unique DNA, ingredient profiles and specific effects on the body¹⁰.

Revolution Macalibrium® is made from a proprietary combination of maca phenotypes selected specifically for men’s reproductive health and hormone strength. Clinical research has shown that different phenotypes support different outcomes¹⁰. Some benefit male fertility, others support women’s hormones and some are even contraindicated for certain men with prostate inflammation. That’s why sourcing the right phenotype matters.

Beyond formulation, Revolution Macalibrium® is also highly concentrated, with up to 10 times more than raw maca, and features nearly 100% water solubility for optimal absorption. In contrast, most raw maca is only about 68% water soluble, which limits its effectiveness.

This level of specificity, concentration and bioavailability is not found in typical maca products and has been evaluated in clinical settings, including a 2024 case report focused on men’s hormone strength and fertility published in the American Journal of Men’s Health¹.*

What is the best dose for fertility support?

Initial Dose for Fertility Support: While the standard dose is one capsule twice daily, we recommend that most men, unless sensitive to supplements, start on two capsules twice daily for the first 2-4 weeks. This dosing regimen will invigorate the endocrine system to allow them to feel the full effects of Revolution Macalibrium®. It also gives men a baseline to compare to when they go on the standard dose, should they need to stay on the higher dose for a more extended period. As an aside, two capsules twice daily for some men will be too much, but they will notice that quickly by a feeling of overstimulation and can reduce to the standard dose immediately. Our complimentary Medical Team is available to advise on adjusting dosage to meet your individual needs.

Standard Dose: 1 capsule twice daily.

When to Take Revolution Macalibrium®: For the best results, it is recommended that you take Macalbrium® twice daily. The first dose is in the morning, with 8-16 oz. of water away from food, ideally before breakfast. The second dose in the PM 30-60 minutes before you normally have an energy low. Do not take after 3 pm as it may impact sleep.

Results Timing: Supporting reproductive health follows the body’s natural rhythm. Since sperm take 3-4 months to fully develop and mature, allow 3–6 months of consistent use to see the full effects, especially when supporting sperm quality and function⁶.*

What can I do if Revolution Macalibrium® isn’t working as expected, or how can I optimize its benefits naturally?

We often refer to Revolution Macalibrium® as the mechanic “tuning the engine”. However, just like a car, the body doesn’t just need to be tuned, it also needs fuel (protein), oil (omega 3s), additives (vitamins and minerals), filters (detoxification support) and much more. So, if you aren’t getting the results you want, it is important to look at the other elements that impact your body’s hormone production and endocrine system, such as: 

  • Increase Protein Intake: Protein provides the amino acids your body needs to build hormones. A general target of 1.2-1.6 g/kg of body weight per day (or roughly 0.55-0.73 g/lb) is often ideal for most men, especially those active or over 40⁷⁻⁹. An easy way to achieve this is to include a protein rich food with each meal that is about the size of your palm, be it three eggs, a piece of fish, meat or chicken or a vegetarian source. 
  • Stay Hydrated with Sole & Minerals: Proper hydration supports the natural detoxification process and nutrient delivery, both essential for hormone health. While many people drink enough water, if that water doesn't have trace minerals or the ideal structure it doesn’t always get absorbed into your cells. Adding a teaspoon of Original Himalayan Crystal Salt® Sole (a mineral-rich salt solution) to 8-12 oz of filtered water in the morning can optimize hydration also impacting adrenal health and muscle function.
  • Include Healthy Fats: Cholesterol is a precursor to testosterone, so extremely low-fat diets may decrease testosterone production¹¹,¹². Polyunsaturated fatty acids, found in foods such as flaxseeds, chia seeds, walnuts and fatty coldwater fish, are a healthy choice to support hormone health and overall metabolic health ¹³,¹⁴.Consult with your health practitioner about the dose and quality of omega-3 fatty acids that would be best for you (note that medications need to be considered). Some evidence suggests omega-3 fatty acids may support testicular function and testosterone levels in men¹⁵,¹⁶. Supplements or coldwater fatty fish (SMASH: salmon, mackerel, anchovies, sardines and herring) are good sources.
  • Prioritize Deep, Consistent Sleep: Much of the body’s natural growth hormone production occurs during deep sleep, which in turn supports healthy testosterone levels. Disrupted or insufficient sleep, especially in the latter part of the night, can lower testosterone and contribute to symptoms like fatigue, low mood and reduced libido¹⁷,¹⁸. Aim for at least seven hours of uninterrupted sleep per night, with a consistent bedtime and wake time, even on weekends. Prioritize sleep hygiene practices that support deeper, continuous sleep, such as minimizing light exposure at night, avoiding caffeine late in the day, maintaining a cool, dark sleep environment and taking 0.3 mg of Herbatonin® supports the circadian rhythm and sleep/wake cycle. Herbatonin® has been shown in cell studies to be 6-9 times more effective than synthetic melatonin in tests of inflammatory activity, antioxidant potential and mitochondrial and cellular health¹⁹.*

These foundational strategies not only optimize your experience with Revolution Macalibrium®, but also support your body’s entire endocrine system for better hormone resilience and overall health.*

When should I start taking Revolution Macalibrium® before trying to conceive?

It is recommended to begin supplementation two to three months prior to attempting conception, as the full cycle of sperm development (spermatogenesis) takes approximately three to four months⁶.

References

  1. Ross K, Schuler C, Sklar M. Optimizing Testosterone Levels and Fertility Outcomes: A Case Series on the Impact of Lepidium peruvianum (Maca-OGTM) in Andropause and Sperm Dysfunction. Am J Mens Health. 2024 Nov-Dec;18(6):15579883241304570. doi: 10.1177/15579883241304570 
  2. Gül, M., Russo, G. I., Kandil, H., Boitrelle, F., Saleh, R., Chung, E., Kavoussi, P., Mostafa, T., Shah, R., & Agarwal, A. (2024). Male Infertility: New Developments, Current Challenges, and Future Directions. The World Journal of Men's Health, 42(3), 502–517. https://doi.org/10.5534/wjmh.230232
  3. Babakhanzadeh, E., Nazari, M., Ghasemifar, S., & Khodadadian, A. (2020). Some of the Factors Involved in Male Infertility: A Prospective Review. International Journal of General Medicine, 13, 29–41. https://doi.org/10.2147/IJGM.S241099
  4. Dabbous, Z., & Atkin, S. L. (2017). Hyperprolactinaemia in male infertility: Clinical case scenarios. Arab Journal of Urology, 16(1), 44–52. https://doi.org/10.1016/j.aju.2017.10.002
  5. Zhou, X. Y., Ma, J. N., Shen, Y. Y., Xie, X. R., & Ren, W. (2023). Effects of Growth Hormone on Adult Human Gonads: Action on Reproduction and Sexual Function. International Journal of Endocrinology, 2023, 7492696. https://doi.org/10.1155/2023/7492696
  6. Amann R. P. (2008). The cycle of the seminiferous epithelium in humans: a need to revisit?. Journal of Andrology, 29(5), 469–487. https://doi.org/10.2164/jandrol.107.004655 
  7. Ketchem, J. M., Bowman, E. J., & Isales, C. M. (2023). Male sex hormones, aging, and inflammation. Biogerontology, 24(1), 1–25. https://doi.org/10.1007/s10522-022-10002-1
  8. Zitzmann M. (2020). Testosterone, mood, behaviour and quality of life. Andrology, 8(6), 1598–1605. https://doi.org/10.1111/andr.12867 
  9. Minich, D. M., Ross, K., Frame, J., Fahoum, M., Warner, W., & Meissner, H. O. (2024). Not All Maca Is Created Equal: A Review of Colors, Nutrition, Phytochemicals, and Clinical Uses. Nutrients, 16(4), 530. https://doi.org/10.3390/nu16040530
  10. Naish, F. & Roberts, J. (1996). The Natural Way to Better Babies: Preconception Health Care for Prospective Parents. Random House Australia. 
  11. Leslie SW, Soon-Sutton TL, Khan MAB. Male Infertility. [Updated 2024 Feb 25]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK562258/ 
  12. Quenby, S., Gallos, I. D., Dhillon-Smith, R. K., Podesek, M., Stephenson, M. D., Fisher, J., Brosens, J. J., Brewin, J., Ramhorst, R., Lucas, E. S., McCoy, R. C., Anderson, R., Daher, S., Regan, L., Al-Memar, M., Bourne, T., MacIntyre, D. A., Rai, R., Christiansen, O. B., Sugiura-Ogasawara, M., … Coomarasamy, A. (2021). Miscarriage matters: the epidemiological, physical, psychological, and economic costs of early pregnancy loss. Lancet (London, England), 397(10285), 1658–1667. https://doi.org/10.1016/S0140-6736(21)00682-6
  13. National, regional, and global estimates of preterm birth in 2020, with trends from 2010: a systematic analysis. Ohuma, Eric O et al. The Lancet, Volume 402, Issue 10409, 1261 - 1271
  14. Barnes, N. (2014). How to Conceive Healthy Babies - The Natural Way. New Generation Publishing.
  15. Rafii, M., Chapman, K., Elango, R., Campbell, W. W., Ball, R. O., Pencharz, P. B., & Courtney-Martin, G. (2015). Dietary Protein Requirement of Men >65 Years Old Determined by the Indicator Amino Acid Oxidation Technique Is Higher than the Current Estimated Average Requirement. The Journal of Nutrition, 146(4), 681–687. https://doi.org/10.3945/jn.115.225631
  16. Jäger, R., Kerksick, C. M., Campbell, B. I., Cribb, P. J., Wells, S. D., Skwiat, T. M., Purpura, M., Ziegenfuss, T. N., Ferrando, A. A., Arent, S. M., Smith-Ryan, A. E., Stout, J. R., Arciero, P. J., Ormsbee, M. J., Taylor, L. W., Wilborn, C. D., Kalman, D. S., Kreider, R. B., Willoughby, D. S., Hoffman, J. R., … Antonio, J. (2017). International Society of Sports Nutrition Position Stand: protein and exercise. Journal of the International Society of Sports Nutrition, 14, 20. https://doi.org/10.1186/s12970-017-0177-8
  17. Bauer, J., Biolo, G., Cederholm, T., Cesari, M., Cruz-Jentoft, A. J., Morley, J. E., Phillips, S., Sieber, C., Stehle, P., Teta, D., Visvanathan, R., Volpi, E., & Boirie, Y. (2013). Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. Journal of the American Medical Directors Association, 14(8), 542–559. https://doi.org/10.1016/j.jamda.2013.05.021
  18. Whittaker, J., & Wu, K. (2021). Low-fat diets and testosterone in men: Systematic review and meta-analysis of intervention studies. The Journal of Steroid Biochemistry and Molecular Biology, 210, 105878. https://doi.org/10.1016/j.jsbmb.2021.105878
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