Allen, N.E. et al. (2000). Hormones and diet: low insulin-like growth factor-I but normal bioavailable androgens in vegan men. British Journal of Cancer, 83(1), 95–97.Ramasamy, R. et al. (2024). The association of plant-based diet with hormone levels in men. World Journal of Urology. Loeb, S. et al. (2024). Plant-based diet and sexual function. [Copywriter to verify journal and DOI before publication.]

Your vegan diet isn’t lowering your testosterone.

But four hard-to-get nutrients may be locking up the testosterone you're already making.

Smiling man in a teal jacket with white headphones around his neck, holding a bowl of salad and eating with a fork outdoors.

You’ve heard it from a podcast, a gym buddy, your own doubt after a few months of feeling off… “Men need a meat-rich diet to boost testosterone.”
But the research doesn’t agree.

4,392 MEN ACROSS 3 PEER-REVIEWED STUDIES.

No evidence that a vegan diet lowers testosterone.

+16%

higher testosterone in plant-forward men vs. meat-eaters.

ALLEN ET AL., 2000 · n = 696 men ¹
No difference

“A plant-based diet was associated with normal testosterone levels.”

RAMASAMY ET AL., 2024 · n = 191 men ²
+8–11%

better sexual function scores in highest plant-based group.

LOEB ET AL., 2024 · n = 3,505 men ³

120

115

110

105

100

+116 Plant-forward men

100 Omnivores

Allen et al. (2000) — total testosterone indexed to omnivore baseline. Adjusted for age and BMI (Body Mass Index).

If your diet isn’t lowering your testosterone, what is?

Your testosterone isn't low, it's locked up.

The studies showing vegan men have normal or higher testosterone were measuring total T. That's not the whole picture.

Only 2–3% of testosterone in the bloodstream is actually usable. The rest is bound to a protein called SHBG and can't do anything. It can't signal to muscles, drive libido, or do its job. It just circulates.

Magnesium controls how much testosterone gets bound up that way. When it's low, more gets locked up. Your lab results look normal, but your body is working with a fraction of what's there.

Zinc and vitamin D3 support the broader hormonal system, and vegan diets run short on both. Plant zinc is partially blocked by phytates, and there's no reliable dietary D3 without animal sources.

But magnesium is the lever most men are missing, and it's the one that explains why the symptoms persist even when the numbers look fine.

The nutrient foundation of usable testosterone.

Your lab results look normal because the T is there—but these four nutrients determine whether or not your body can actually use it.

Nutrient

How it affects your testosterone

Why vegan diets fall short

Zinc

picolinate

Supports the cells that produce testosterone and overall hormonal function.

Plant zinc is partially blocked by phytates, reducing absorption significantly.

Magnesium

absorbable form

Controls how much testosterone binds to SHBG and stays locked up and unusable.

Soil depletion has reduced food sources. No animal-based buffer in vegan diets.

Vitamin D3

from lichen

Signals directly to testosterone-producing cells and supports hormonal balance.

No dietary D3 in vegan food. 42% of US adults deficient regardless of diet.

Vitamin B12

methylcobalamin

Supports energy metabolism and nerve function — the symptoms most men notice first.

Zero reliable dietary sources in a vegan diet.

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The precision formula for vegan men.

COMPLEMENT Essential closes all four gaps — right forms, right doses, without boosters or stimulants.

For vegan men, addressing the handful of nutrient gaps does more than unlock testosterone, it supports sleep quality, stress response, energy metabolism, immune function, and even brain health.

DHA is a good example. It has nothing to do with testosterone, but it's one of the most consequential nutrients missing from a vegan diet. Brain cells are structurally built from it. Without a direct source, most vegan men are running low without knowing it.

Closing these gaps doesn't just mean feeling like yourself in the gym or in bed, it means feeling like yourself, period — sharper, steadier, and better resourced for the long run.

That's what Essential is built around.

Built around the cluster. In the forms the body absorbs.

COMPLEMENT® Essential delivers the four cognitive nutrients in the bioactive forms the brain actually uses. COMPLEMENT® ForHer adds iron — for women in perimenopause whose ferritin is quietly being drained — plus women-specific support for midlife biology.

COMPLEMENT® ESSENTIAL

The foundation · Three capsules daily
- Zinc picolinate — 8 mg
- Magnesium — 200 mg (absorbable form)
- Vitamin D3 (lichen) — 2,000 IU
- Methylcobalamin B12 — 300 mcg
- Algae DHA/EPA — 470 mg
- Kelp iodine — 150 mcg
- L-selenomethionine — 50 mcg
- Vitamin K2
Why the forms matter
- Zinc picolinate, not zinc oxide
- Magnesium in an absorbable form, not oxide (~4% absorption)
- D3 from lichen, not the less-effective D2
- Methylcobalamin B12, not cyanocobalamin
- Algae DHA/EPA, not ALA from flaxseed
No stimulants. No testosterone boosters. No adaptogen stack. The discipline is in what’s left out.

No stimulants. No nootropic stack. Third-party tested. The discipline is in what’s left out.

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Image listing essential nutrients and their amounts: Vitamin K2 50mcg, Vitamin D3 50mcg, DHA/EPA Omega-3s 470mg, Iodine 150mcg, Magnesium 200mg, Selenium 50mcg, Zinc 8mg, Vitamin B12 300mcg. Three black capsules are shown.

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COMPLEMENT® Essential

4.86

2446+ Reviews

8 nutrients. 1 capsule. The gaps from tonight’s webinar, closed.

Servings

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30 Servings

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60 Servings

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180 Servings

One-Time Purchase

$49.00

FREE glass jar ($15 value)
BONUS guides ($34 value)

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30% off today, 15% off future orders

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Supports all-day energy, immune, heart, & brain health.*
Promotes foundational health & longevity.*
Helps regulate normal metabolism.*
Third-party tested.
100% compostable pouch.
Essenced with peppermint.

Supplement Facts Third Party Test Results

Ingredients

Vitamin K2 - 50 mcg:
K2 isn't available in plant-based foods except for natto, a Japanese fermented soy product (and it's not in tempeh), so those eating Western diets need to supplement in order to get it.

Vitamin D3 - 50 mcg:
We love nature and spending time outdoors. But we also wear clothing, and most of us work inside during daylight hours. That means our natural ability to soak up the sun's rays is limited, and as a result, many of us — regardless of dietary pattern — might be deficient in Vitamin D.

DHA/EPA Omega-3s - 470 mg:
Vegan food sources of Omega-3s like flax and chia seeds don’t provide two essential types — namely DHA and EPA. Seeds provide ALA Omega-3s, and are an amazing addition to your plate, but most people do not convert ALA into DHA and EPA.

Iodine - 150 mcg:
Worldwide, iodine deficiency affects two billion people and is the leading preventable cause of intellectual and developmental disabilities. In plant foods, iodine is found inconsistently and depends on the iodine content of the soil. It’s possible to get enough iodine if you regularly eat seaweed (multiple times a week), or use iodized salt, but this is one essential nutrient that shouldn’t be overlooked whether you’re vegan or not.

Magnesium - 200 mg:
Soil depletion is a major cause of Magnesium deficiency in the overall population, and affects vegans as well as non-vegans.

Selenium - 50 mcg:
Our depleted soil may mean that plant foods, in general, do not contain enough Selenium (and that’s even true for some Brazil nuts).

Zinc - 8 mg:
Legumes and seeds are the best natural sources on a plant-based diets, but vegans who avoid those food groups, as well as those who are worried about its bioavailability can benefit from the addition of Zinc with Complement Essential.

Vitamin B12 - 300 mcg:
Soil bacteria produce Vitamin B12 — which is essential for humans in order to protect neutral health and reduce inflammation. But modern agriculture and other human behaviors decimate these bacterial colonies that produce B12.

Who is this for?

COMPLEMENT Essential is for people who eat a plant-forward or plant-based diet and want a simple, reliable way to support long-term health without overcomplicating supplementation.

It is designed to complement a healthy whole-food diet by providing key nutrients that are commonly underconsumed in plant-forward eating patterns, including vitamin B12, vitamin D3, iodine, zinc, selenium, and plant-based omega-3s.

If your goal is to support longevity by nourishing your heart, brain, immune system, and overall vitality so you can feel like your most vibrant self each day, COMPLEMENT Essential is for you.

The science

Instead of cramming together dozens of vitamins and minerals you're already getting through food, Complement Essential focuses on the 8 hard-to-get nutrients, in dosages that make a difference.

Here's a look at the science:

Vitamin B12 among Vegetarians: Status, Assessment and Supplementation. LINK

Prevalence and correlates of vitamin D deficiency in US adults. LINK

Linus Pauling Institute,Micronutrient Information Center, Iodine LINK

Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. LINK

Linus Pauling Institute,Micronutrient Information Center, Essential Fatty Acids LINK

Status of the World’s Soil Resources. LINK

A healthy gastrointestinal microbiome is dependent on dietary diversity. LINK

Distinct microalgae species for food—part 2: comparative life cycle assessment of microalgae and fish for eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and protein. LINK

Life cycle assessment of fish oil substitute produced by microalgae using food waste. LINK

How to use Essential

Take 3 capsules daily with a meal.

Taking Essential with food helps support optimal absorption of fat-soluble nutrients and omega-3s, and is gentle on digestion.

For best results, use consistently as part of your daily routine alongside a balanced, whole-food diet and healthy lifestyle.

What are the benefits?

COMPLEMENT Essential is designed to support foundational health by filling common nutrient gaps in plant-forward and plant-based diets. Each nutrient is included at meaningful, evidence-based amounts to support key systems involved in long-term vitality.*

Supports heart health and cardiovascular function*

Plant-based DHA and EPA omega-3s support normal heart function and cardiovascular health
Vitamin D3 and K2 help support healthy calcium metabolism, which plays a role in vascular health

Supports brain health and cognitive function*

DHA omega-3s are a major structural component of the brain and support normal cognitive function
Vitamin B12 supports nervous system health and neurotransmitter function

Supports immune system function*

Vitamin D3 helps support immune response
Zinc and selenium support immune cell activity and antioxidant defenses

Supports energy metabolism and nervous system health*

Vitamin B12 supports normal energy metabolism and red blood cell formation
Iodine supports thyroid function, which plays a key role in energy regulation

Supports bone and muscle health*

Vitamin D3 and K2 support bone health by helping the body absorb and properly utilize calcium
Magnesium supports normal muscle function and neuromuscular signaling

Designed to complement a whole-food diet

COMPLEMENT Essential does not attempt to replace food. Instead, it provides targeted nutrients that are commonly difficult to obtain in sufficient amounts from plant-forward diets alone, helping support long-term health without unnecessary excess.

HSA/FSA Eligible with

We've partnered with Truemed to make Complement eligible for Health Savings Account (HSA) and Flexible Spending Account (FSA) spending. Simply take a short 2-minute survey after purchase to start the reimbursement process.

Evidence-Based. Expert-backed.

Leaders in plant-forward nutrition trust COMPLEMENT® to support their healthy lifestyles.

A middle-aged man in a white lab coat with Joel K. Kahn, MD embroidered, smiling and standing in an office with framed certificates and awards on the wall behind him.

Joel Kahn, MD

Bestselling Author & Holistic Cardiologist

COMPLEMENT® Science Advisory

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Laurie Marbas, MD

Lifestyle & Family Medicine Physician

COMPLEMENT® ForHer Co-Formulator

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Matt Frazier

NYT Bestselling Author & Founder of No Meat Athlete

COMPLEMENT® Co-Founder

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As seen on

★★★★★

200,000+ customers threw out their supplement drawer.

★★★★★

COMPLEMENT® Essential

"At 54, I still feel strong, active, and motivated. The science behind the product is what convinced me to try it, and the results are why I've stayed with it."

— Verified buyer | 12 weeks

★★★★★

COMPLEMENT® Essential

"Essential has become the simplest part of my routine. It gives me confidence that I'm covering the key nutrients I need to support my vitality, performance, and overall well-being."

— Verified buyer | 2 months

★★★★★

COMPLEMENT® Essential

"I was skeptical when I first heard that a vegan diet doesn't have to compromise men's health. Six months later, I feel the difference for myself. Better energy, better recovery, and none of the concerns I used to have about getting the right nutrients."

— Verified buyer | 6 months

Common questions.

Why not just take a testosterone booster?

Boosters add stimulants and adaptogens on top of a depleted system — they don’t fix the nutrient gaps producing the symptoms. The Leydig cells need zinc to synthesize testosterone in the first place. Magnesium controls how much stays free. Vitamin D signals the cells directly. Without those in place, no booster will make the system work properly. Essential isn’t a booster. It’s the foundation boosters require to do anything at all.

Why not just take zinc, or magnesium, on its own?

Because the cluster is what produces the symptoms. Taking one nutrient alone while still low in the others produces marginal improvement and convinces most men supplementation “doesn’t work.” The convergent fix is the difference.

What if my testosterone really is low?

See a doctor. Essential isn’t a substitute for medical care. But the symptoms most men attribute to low T are usually nutrient gaps — worth addressing before assuming anything more serious.

A white and light blue pouch labeled Complement Essential spills black capsules onto a dark green surface. The text on the pouch reads: Science-backed multinutrient for your plant-based diet.

The vitality you’ve lost isn’t your testosterone.

It’s the nutrients your testosterone is built from. Essential is the precision correction.

Dr. Joel Kahn, MD
co-formulated

200,000+
customers

100-day
guarantee

Third-party
tested

Shop Essential

What exactly is in Essential?

The 6 nutrients from tonight’s webinar (zinc, selenium, iodine, magnesium, K2, DHA/EPA) plus B12 and D3. All in researched doses. Nothing else.

How long do I have to use this offer?

48 hours from when the webinar ended. After that, this page goes away.

Can I cancel the subscription?

Anytime. No hoops. No “call this number between 9 and 5.” Just click cancel in your account.

What if I don’t like it?

100-day money-back guarantee. Not 30 days. 100. If you’re not happy, you get a full refund. We’ve been doing this for years and we stand behind it.

I already take B12 and D3 separately. Why switch?

Because tonight Cyrus showed you there are 6 other nutrients you’re probably not covering. Essential replaces your B12 and D3 AND adds the 6 gaps you just learned about. One capsule instead of a drawer full of bottles.

Is this available anywhere else at this price?

No. 30% off first order is exclusive to this page for webinar registrants. It’s not on our website, not in our regular emails, and won’t be repeated.

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Sources

Allen, N.E. et al. (2000). Hormones and diet: low insulin-like growth factor-I but normal bioavailable androgens in vegan men. British Journal of Cancer, 83(1), 95–97.
Ramasamy, R. et al. (2024). The association of plant-based diet with hormone levels in men. World Journal of Urology. 
Loeb, S. et al. (2024). Plant-based diet and sexual function. [Copywriter to verify journal and DOI before publication.]

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100% Happy

We stand behind our products 100%. If you’re not happy with the results, taste, or experience, we’ll fix it.

100-Day Guarantee

You have a full 100 days after receiving your product to try it out and see if it’s the right fit for you.

100% Money-Back

And if you don’t love it within the first 100 days, we’ll issue a full refund. No questions asked. No fine print. That’s the COMPLEMENT® guarantee.

Shop Essential

Your vegan diet isn’t lowering your testosterone.

No evidence that a vegan diet lowers testosterone.

If your diet isn’t lowering your testosterone, what is?

The nutrient foundation of usable testosterone.

The precision formula for vegan men.

Built around the cluster. In the forms the body absorbs.

COMPLEMENT® Essential

Ingredients

Who is this for?

The science

How to use Essential

What are the benefits?

HSA/FSA Eligible with