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Episode
Why Men Today Have HALF the Testosterone of Their Grandfathers
~11 min
Episode Brief·YouTube

Why Men Today Have HALF the Testosterone of Their Grandfathers

Eric Berg
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TL;DR

The four things you'd lose by not watching

4 items

TL;DR

The four things you'd lose by not watching

4 items
1

Men today have over 50% less testosterone than decades ago, with low sperm count and fertility also declining.

2

Six signs: gynecomastia, shrinking testicles, reduced semen, decreased body hair, hot flashes/night sweats, and excess belly fat from insulin resistance.

3

Hidden causes include endocrine disruptors (plastics, forever chemicals), lack of sleep, stress, WiFi/EMF, phytoestrogens (soy), low zinc, statins, and iron overload due to copper deficiency.

4

Solutions: zinc (up to 50 mg/day with trace minerals), magnesium glycinate (400-800 mg), vitamin D (10,000 IU/day), heavy resistance training, a water filter for PFAS, and L. reuteri probiotic yogurt (300 billion CFU per half cup) to boost oxytocin and testicle size.

Protocols

Concrete recipes — what, when, how much, and why

6 items

Zinc supplementation with trace minerals

WhatTake up to 50 mg of zinc daily, ideally in a trace mineral complex to prevent copper deficiency.
WhenDaily.
DoseUp to 50 mg per day.
For whomMen with low testosterone or those looking to optimize levels.
WhyZinc is essential for the enzymatic conversion of cholesterol into testosterone.
CaveatsTaking zinc alone without other trace minerals can cause copper deficiency over time, leading to iron accumulation and potentially worsening testosterone.

He emphasizes that the RDA of 8-11 mg is insufficient for boosting testosterone; 50 mg is needed. However, zinc must be balanced with copper and other trace minerals to avoid creating a copper deficiency, which would raise iron and harm testosterone. Food sources include red meat, oysters, liver, and shellfish.

Mechanism

Zinc acts as a cofactor for enzymes that convert cholesterol into pregnenolone and then testosterone. Without adequate zinc, this conversion is impaired.

the rdas for zinc are between 8 and 11 milligrams that is just not enough you're going to probably need up to maybe 50 milligrams every single day

Also said
“the problem is if you're going to be taking zinc by itself without being in a base of trace minerals you're going to end up over time creating a copper deficiency and then your iron's going to go up and that can affect your testosterone”— Warns about the copper-iron cascade.

Magnesium glycinate supplementation

WhatTake magnesium glycinate, 400-800 mg per day.
WhenDaily.
Dose400-800 mg per day.
For whomMen with low testosterone; those taking the wrong form (oxide) should switch.
WhyMagnesium is a helper mineral for the conversion of cholesterol to testosterone.
CaveatsAvoid magnesium oxide; use glycinate form for better absorption.

He notes that many people take the wrong type of magnesium (oxide), which is poorly absorbed. Magnesium glycinate is preferred. The dosage should be at least 400 mg, but 600-800 mg may be more effective for testosterone support.

Mechanism

Magnesium participates in enzymatic reactions that produce steroid hormones, including testosterone, from cholesterol.

magnesium is also another helper mineral to help you convert cholesterol into the steroid testosterone and a lot of people take the wrong magnesium you want to take the Magnesium glycinate minimum 400 milligrams per day but probably a little bit more maybe 600 or even 800 milligrams per day

High-dose vitamin D3

WhatTake at least 10,000 IU of vitamin D3 daily as a maintenance dose.
WhenDaily.
Dose10,000 IU per day.
For whomMen with low testosterone, insulin resistance, or suboptimal vitamin D levels.
WhyVitamin D directly increases testosterone, improves insulin resistance, and supports liver function.
CaveatsMost people take too little; 10,000 IU is a maintenance dose, not a short-term loading dose.

He stresses that typical vitamin D recommendations are far too low. 10,000 IU daily is needed to raise testosterone and address insulin resistance and liver issues that contribute to low T. This is a foundational supplement.

Mechanism

Vitamin D receptors are present in testicular Leydig cells, and vitamin D upregulates enzymes involved in testosterone synthesis. It also improves insulin sensitivity, reducing the insulin-driven fat storage that worsens hormonal balance.

the big point about vitamin D is most people are taking way too little vitamin D you're going to need as a maintenance dosage at least 10,000 IUS of vitamin D every single day to help you increase testosterone and to help you fix insulin resistance fix certain things in your liver

Heavy resistance training or HIIT

WhatEngage in heavy weight training, resistance exercise, or high-intensity interval training, with adequate rest.
WhenRegularly, with sufficient recovery between sessions.
DoseNot specified; emphasis on intensity and rest.
For whomMen looking to boost testosterone.
WhyThese forms of exercise are potent stimuli for testosterone production.
CaveatsMust be paired with enough rest; overtraining can raise cortisol and lower testosterone.

He says that heavy weight training, resistance exercise, and HIIT are all effective, but rest is crucial. The combination of intense exercise and recovery triggers a hormonal response that increases testosterone.

you're going to find if you do heavyweight training or resistance exercise training or even high-intensity interval training paralleled with enough rest you're going to find that's a potent stimulus of testosterone

Filtering forever chemicals from drinking water

WhatInstall a water filter that removes PFAS (forever chemicals).
WhenFor all drinking water, especially if on city water.
DoseOngoing.
For whomAnyone on municipal water supply.
WhyForever chemicals in tap water are endocrine disruptors that accumulate and lower testosterone.
CaveatsNot all filters remove PFAS; speaker knows of three effective ones (links provided).

He explains that city water contains forever chemicals that act as endocrine disruptors, and filtering them out is a critical step to reduce exposure. He mentions three specific filters he will link in the description.

get a water filter that helps you filter out forever chemicals there's three that I know about I will put those links down below

L. reuteri probiotic yogurt

WhatConsume half a cup of cultured L. reuteri yogurt providing approximately 300 billion CFU daily.
WhenEvery day.
DoseHalf a cup (approx. 300 billion CFU) per day.
For whomMen with low testosterone; especially those who have taken antibiotics (96% of population lacks this microbe).
WhyL. reuteri increases testicle size (and thus testosterone), boosts oxytocin to counter cortisol, improves sleep, and may enhance muscle stem cells.
CaveatsHuman studies are lacking; evidence from rat study and anecdotal reports. Not a replacement for medical treatment.

He describes L. reuteri as a microbe present in only 4% of people due to past antibiotic use. It can be cultured into a yogurt-like food with very high CFU counts. A rat study showed that older mice given L. reuteri in water had significant testicular growth. Although no human trials exist, he has spoken to many people taking it who report a spike in testosterone, better sleep, vivid dreams, and more nocturnal erections (a sign of higher testosterone). He also mentions reports of increased stem cells for muscle repair, especially with aging.

Mechanism

L. reuteri increases oxytocin, a hormone that antagonizes cortisol. Lower cortisol allows testosterone to rise. Additionally, by increasing testicle size, it directly boosts testosterone production. The improved sleep and nocturnal erections are downstream effects of higher testosterone and lower stress.

Personal experience

I've been talking to a lot of people that are taking this microbe and they're noticing a great increased spike in testosterone

there's an interesting study on rats they fed these rats El rudai in their water and the group that got El rudai had significant increase in the growth of their testicles even though they were older mice

Also said
“this El Rudi can be cultured and made into kind of like a yogurt type mixture which is in very very high amounts per half of a cup it's like 300 billion and you would consume this every single day”— Specifies the preparation and dosage.
“it increases something called oxytocin probably the most powerful hormone to counter cortisol you're going to sleep a lot better you're going to have vivid dreams dreams more erections during the night which is an indication of higher testosterone”— Explains the oxytocin-cortisol mechanism and subjective benefits.
“plus there's been reports that increasing stem cells for muscle tissue especially as you age”— Additional anti-aging benefit.

What's new

Personal practice updates, fresh positions, predictions

5 items

endocrine-disruptors

The main driver of low testosterone today is environmental endocrine disruptors—pesticides, plastics, microplastics, and forever chemicals in water—that mimic estrogen.

Why this matters: Shifts blame from diet/lifestyle to pervasive environmental chemicals that accumulate and don't break down.

Background

Conventional focus on junk food and sugar; speaker argues these are secondary.

He explains that endocrine disruptors are chemicals that mimic estrogen, including pesticides, herbicides, fungicides, plastics, and microplastics. A major source is drinking water, especially city water, which contains 'forever chemicals' (PFAS) that persist for thousands of years and accumulate in the body. These chemicals disrupt hormonal balance, leading to feminization and low testosterone. He emphasizes that this is the 'real big cause' and that many people are unaware of the extent of exposure.

the real big cause of lowered testosterone presently is endocrine disruptors

Also said
“one of the biggest primary sources of plastic that we're getting right now is in our water supply”— Highlights water as a key exposure route.
“I don't know if you've heard about forever chemicals but they accumulate in your body and they just don't break down it takes like a thousand years for these chemicals to break down”— Emphasizes persistence and accumulation.

wifi-emf

WiFi and electromagnetic fields from cell phones, especially when kept in pockets or near the head, are a hidden cause of low testosterone.

Why this matters: Unconventional cause not commonly discussed in mainstream medicine.

He states that WiFi and EMFs from devices like cell phones can decrease testosterone. He specifically warns against keeping phones in pockets or against the head, advising to use speakerphone. This is presented as a 'hidden source' alongside other environmental factors.

another hidden source of decreased testosterone is WiFi and electromagnetic fields from things like this especially if you're putting these in your pocket

Also said
“keep this away from your body put on speaker phone but don't keep it close anywhere in your pockets or even next touching your head”— Practical advice to reduce exposure.

phytoestrogens-soy

Soy products (soy milk, soy protein isolates in powders and bars, vegetarian meats) contain phytoestrogens that can cause gynecomastia and even lactation in men.

Why this matters: Includes a striking clinical anecdote of a man developing breast tissue and lactation from a gallon of soy milk daily.

Background

Soy is often marketed as a health food, but its estrogenic effects are underappreciated.

He explains that phytoestrogens in soy can mimic estrogen, contributing to feminization. He shares a case from his practice: a man consuming a gallon of soy milk per day developed breast tissue and lactation. He also notes that soy protein isolates are common in protein powders and bars, and in vegetarian meats, making exposure widespread.

Personal experience

In practice I met a guy who was consuming about a gallon of soy milk a day he started developing breast tissue and get this with lactation I am not kidding

in practice I met a guy who was consuming about a gallon of soy milk a day he started developing breast tissue and get this with lactation I am not kidding

Also said
“soy products soy milk soy protein iets which is probably one of the most common protein in protein powders as well as those protein bars that would be also in the vegetarian Meats”— Lists common sources of soy phytoestrogens.

iron-overload-copper-deficiency

Excess iron accumulation, due to the body's inability to excrete it, rusts organs and lowers testosterone; the root cause is often copper deficiency, which impairs iron regulation.

Why this matters: Challenges the common assumption that anemia equals low iron; instead, it's dysfunctional iron locked in cells due to low copper.

He explains that the body has no mechanism to eliminate excess iron, so it accumulates in organs and causes oxidative damage ('rusts out the organs'). In anemia, people have dysfunctional iron: not enough available for red blood cells, but excess trapped inside cells because copper-dependent enzymes that manage iron are deficient. Thus, copper deficiency is the real problem behind iron overload, and this excess iron can lower testosterone.

what's interesting about iron is that our body has no mechanism of getting rid of iron and so what happens is this iron accumulates in your organs and it starts to rust out the organs

Also said
“if you're anemic you don't have low iron you have dysfunctional iron not only do you not have enough iron to feed the red blood cells that's why you're tired but you also have an excess of iron inside the cells because it's all locked up because you're deficient in copper”— Clarifies the paradoxical iron status in anemia.
“a deficiency of copper is really at the bottom of this problem with excess iron”— Identifies copper as the root cause.

statins-cholesterol-testosterone

Cholesterol-lowering drugs (statins) can cause low testosterone because cholesterol is the raw material for testosterone synthesis.

Why this matters: Links a common medication to hormonal decline, often overlooked.

He notes that testosterone is made from cholesterol, with zinc as a cofactor. Therefore, blocking cholesterol production with statins can directly reduce testosterone levels. This is presented as a potential cause for men on these drugs.

cholesterol is also needed as a raw material so if you're on a a cholesterol blocking drug AKA statins that could be the reason why you have low testosterone

Disclosed sponsorships1speaker disclosed

Water filter for PFAS removal

Product Sponsored · disclosed

To remove endocrine-disrupting forever chemicals from tap water.

DisclosureSpeaker states he will provide links to three specific filters in the video description, which are likely affiliate links.

He emphasizes that city water contains forever chemicals that accumulate and don't break down, making filtration essential. He knows of three effective filters and will link them below.

get a water filter that helps you filter out forever chemicals there's three that I know about I will put those links down below

Find Water

Notable quotes

Lines worth pulling out — contrarian, specific, or perfectly phrased

6 items
men today have over 50% less testosterone than they had several decades ago
Stark statistic framing the problem.
the real big cause of lowered testosterone presently is endocrine disruptors
Central thesis shifting blame to environmental chemicals.
if you're getting under 7 hours of sleep I'll guarantee your testosterone is probably pretty low
Strong causal claim linking sleep to testosterone.
in practice I met a guy who was consuming about a gallon of soy milk a day he started developing breast tissue and get this with lactation I am not kidding
Shocking clinical anecdote illustrating phytoestrogen danger.
what's interesting about iron is that our body has no mechanism of getting rid of iron and so what happens is this iron accumulates in your organs and it starts to rust out the organs
Vivid metaphor for iron overload.
there's an interesting study on rats they fed these rats El rudai in their water and the group that got El rudai had significant increase in the growth of their testicles even though they were older mice
Provocative animal study supporting the probiotic's effect.

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Topics covered

low-testosterone-signsendocrine-disruptorssleep-and-testosteronestress-cortisolwifi-emfphytoestrogenszinc-deficiencycholesterol-statinsiron-overload-copperzinc-supplementationmagnesium-glycinatevitamin-d-dosageexercise-testosteronewater-filter-forever-chemicalsl-reuteri-probiotic
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