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Originally posted by @stephencabral on Instagram · 70s|Watch on Instagram
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Auto-generated transcript of @stephencabral's video. Quoted here for educational fact-check commentary; original creator retains all rights to the video content.

  1. 0:00We do a lot of hormone testing in our practice and what we've seen, especially over the last decade,
  2. 0:04our men's testosterone levels are dropping. There are three main reasons for that.
  3. 0:09The first one is that men are no longer lifting weights or being as physical, doing manual labor
  4. 0:15as they were decades previous to that. The second reason is that men are dealing with,
  5. 0:20and women as well, chronic stress that is simply unrelenting. So we usually have stress in our
  6. 0:26things come up, but there's a resolution. When there's no resolution to stress, what happens is
  7. 0:31that chronically elevated cortisol lowers testosterone over time. And the third reason is
  8. 0:37we no longer get as much sunlight as we used to, especially the first half of the day.
  9. 0:41Sunlight is a natural diurnal rhythm singular. That means the first half of the day, when we get
  10. 0:47sunlight, we increase natural production of cortisol. So the second half of the day, cortisol and
  11. 0:53fight or flight begin to lower. So again, we have to turn off those blue lights at night,
  12. 0:57get the blue light from the sun in the morning, allow our cortisol levels to fall out late,
  13. 1:01and at the same time, melatonin levels rise. When that happens, we get overnight rejuvenation,
  14. 1:06better sleep, and healthy levels of testosterone production in the morning.

Dr. Cabral's testosterone claims aren't telling the full story

Dr. Stephen Cabral, Board Certified Doctor of Naturopathy

Instagram creator

5.9K viewsView on Instagram →

Quick answer

Testosterone is the primary male sex hormone produced by the testes, with normal levels ranging 300-1,000 ng/dL. Population studies show declining levels over recent decades, but individual variation is significant and natural age-related decline of 1-2% annually is normal. Clinical hypogonadism requiring treatment occurs when levels fall below 300 ng/dL with associated symptoms.

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This page currently connects to 7 source-backed evidence items through visible references or structured citation data.

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For Dr. Cabral's testosterone claims aren't telling the full story, FormBlends checks the page topic against primary trials, systematic reviews, guidelines, and current PubMed-indexed literature where available. These citations are context, not medical advice, proof of eligibility, or a claim that every study applies to every patient.

Randomized trialTestosterone and TRT evidence2023

Cardiovascular Safety of Testosterone-Replacement Therapy

TRAVERSE trial anchor for cardiovascular-safety discussions in appropriately diagnosed men.

PubMed

GuidelineTestosterone and TRT evidence2010

Testosterone therapy in men with androgen deficiency syndromes: an Endocrine Society clinical practice guideline

Guideline anchor for diagnosis, monitoring, contraindications, and appropriate TRT framing.

PubMed

ReviewNAD+ and precursor evidence2021

NAD+ metabolism and its roles in cellular processes during ageing

Core review for NAD+ decline, mitochondrial function, DNA repair, and aging biology.

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Randomized trialNAD+ and precursor evidence2021

Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women

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What this exact clip is really saying

This FormBlends review is specific to "Dr. Cabral's testosterone claims aren't telling the full story" from Dr. Stephen Cabral, Board Certified Doctor of Naturopathy. We read the clip as a TRT social video fact-checks claim about Testosterone, then separate the useful signal from what a short social video cannot prove. The page-specific claim focus is: Testosterone is the primary male sex hormone produced by the testes, with normal levels ranging 300-1,000 ng/dL.

The reason this review is not generic is the source wording and the canonical claim label "trt why is it that men s testosterone levels are dropping ther." In this clip, the useful excerpt is: "We do a lot of hormone testing in our practice and what we've seen, especially over the last decade, our men's testosterone levels are dropping." That wording changes the review because it points to Testosterone evidence, safety, and patient-fit context, not a one-size-fits-all protocol.

The source trail for this page is checked against Cardiovascular Safety of Testosterone-Replacement Therapy (2023), Testosterone therapy in men with androgen deficiency syndromes: an Endocrine Society clinical practice guideline (2010), and Functional testosterone deficiency in aging men: Clinical impact, diagnostic pathways, and treatment strategies (2026), plus the creator's own wording. Testosterone decisions still need an eligibility review, medication-interaction screen, access check, and quality-control review before anyone treats a social clip as medical advice.

Resistance training increases testosterone 15-30% for 15-30 minutes post-workout but long-term effects are modest
People who land here are usually comparing the Testosterone claim with testosterone, menshealth, and lowt.
The strongest next step is to compare the claim with FormBlends' Testosterone guide, evidence notes, and provider review path before acting.

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Claim being checked

Testosterone is the primary male sex hormone produced by the testes, with normal levels ranging 300-1,000 ng/dL.

FormBlends verdict

Testosterone evidence, safety, and patient-fit context

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What it helps with

  • Testosterone is the primary male sex hormone produced by the testes, with normal levels ranging 300-1,000 ng/dL. Population studies show declining levels over recent decades, but individual variation is significant and natural age-related decline of 1-2% annually is normal. Clinical hypogonadism requiring treatment occurs when levels fall below 300 ng/dL with associated symptoms.
  • Male testosterone levels declined 1.2% annually from 1987-2004 in population studies, independent of age and health status
  • Resistance training increases testosterone 15-30% for 15-30 minutes post-workout but long-term effects are modest

What it may miss

  • It may not cover eligibility, contraindications, medication interactions, lab history, or dose escalation.
  • Compound access, legal status, and product quality still need a separate safety check.
  • Social video captions rarely show the full evidence base behind a claim.

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What You'll Learn

  • Male testosterone levels declined 1.2% annually from 1987-2004 in population studies, independent of age and health status
  • Resistance training increases testosterone 15-30% for 15-30 minutes post-workout but long-term effects are modest
  • Vitamin D supplementation raised testosterone from 283 to 362 ng/dL, but only in men with deficiency below 20 ng/mL
  • Endocrine-disrupting chemicals like phthalates correlate with 10-20% lower testosterone levels in epidemiological studies
  • Normal testosterone ranges 300-1,000 ng/dL with natural decline of 1-2% annually after age 30
  • Clinical hypogonadism requires testosterone below 300 ng/dL plus symptoms, not just suboptimal lifestyle habits
  • Proper evaluation requires two morning testosterone measurements between 7-10 AM when levels peak

Our take · Written by FormBlends editorial team · Reviewed by FormBlends Medical Team · This is not a transcript. It is our independent review of the video above.

What does this naturopathic doctor claim about testosterone?

Dr. Stephen Cabral argues men's testosterone levels are dropping due to three main factors: less weight lifting and physical labor, more chronic stress, and reduced sunlight exposure. He proposes a "simple fix" of lifting weights, managing stress, and getting more sun.

While these lifestyle factors can influence testosterone, Cabral's explanation oversimplifies a complex issue. He's cherry-picked three contributors while ignoring major environmental and demographic factors that research shows play larger roles in population-wide testosterone decline.

Is testosterone actually declining across populations?

Yes, multiple studies confirm this trend. The Massachusetts Male Aging Study found testosterone levels declined 1.2% per year from 1987 to 2004, independent of age and health status (Travison et al., Journal of Clinical Endocrinology & Metabolism, 2007).

Danish researchers documented a 14% decline in sperm concentration and 20% decline in total testosterone between 1996 and 2016 (Andersson et al., Human Reproduction, 2019). Similar patterns appear across Western countries.

This isn't just about individual lifestyle choices. Population-level declines suggest systemic environmental factors that Cabral doesn't mention.

Does exercise and sunlight actually boost testosterone levels?

Resistance training does increase testosterone, but the effects are modest and temporary. A meta-analysis found acute resistance exercise raises testosterone 15-30% for 15-30 minutes post-workout (Vingren et al., Sports Medicine, 2010).

Long-term training studies show mixed results. Some find small increases in resting testosterone, others show no change or even decreases in overtrained athletes.

Sunlight exposure through vitamin D synthesis may support testosterone production. Men with vitamin D deficiency (below 20 ng/mL) who supplemented for one year saw testosterone increase from 283 to 362 ng/dL (Pilz et al., Hormone and Metabolic Research, 2011). However, this only applies to deficient individuals.

What major factors is Cabral ignoring?

Cabral completely misses endocrine-disrupting chemicals (EDCs), which research suggests are primary drivers of testosterone decline. Phthalates, found in plastics and personal care products, consistently correlate with lower testosterone in epidemiological studies.

The NHANES data shows men with higher urinary phthalate metabolites had testosterone levels 10-20% lower than those with minimal exposure (Meeker et al., Environmental Health Perspectives, 2009).

PFAS chemicals, obesity rates, and pharmaceutical use also contribute significantly. A study of 4,045 men found obesity accounted for larger testosterone decreases than aging alone (Travison et al., Clinical Endocrinology, 2008). These aren't lifestyle choices you can easily "fix" with more squats.

What should men actually know about testosterone?

Normal testosterone ranges from 300-1,000 ng/dL, with significant individual variation. Levels naturally decline 1-2% annually after age 30, which is normal aging, not necessarily a problem requiring intervention.

Before chasing lifestyle fixes, get proper testing. Total testosterone should be measured twice, preferably between 7-10 AM when levels peak. Free testosterone and SHBG provide additional context your doctor needs.

If you're experiencing genuine symptoms of low testosterone (persistent fatigue, decreased libido, mood changes), see an endocrinologist rather than following social media advice. TRT carries real risks including cardiovascular events and fertility impacts that require medical supervision.

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About the Creator

Dr. Stephen Cabral, Board Certified Doctor of Naturopathy · Instagram creator

5.9K views on this video

Why is it that men’s testosterone levels are dropping? There are 3 main reasons: 1. Men are no longer lifting weights and doing as much physical labor 2. Men are dealing with more chronic stress, wh

Frequently asked questions

Quick answers based on this video and our medical team review.

What does the video say about male testosterone levels declined 1.2% annually from 1987-2004 in population?

Male testosterone levels declined 1.2% annually from 1987-2004 in population studies, independent of age and health status

What does the video say about resistance training increases testosterone 15-30% for 15-30 minutes post-workout?

Resistance training increases testosterone 15-30% for 15-30 minutes post-workout but long-term effects are modest

What does the video say about vitamin d supplementation raised testosterone from 283 to 362 ng/dl,?

Vitamin D supplementation raised testosterone from 283 to 362 ng/dL, but only in men with deficiency below 20 ng/mL

What does the video say about endocrine-disrupting chemicals like phthalates correlate with 10-20% lower testosterone levels?

Endocrine-disrupting chemicals like phthalates correlate with 10-20% lower testosterone levels in epidemiological studies

What does the video say about normal testosterone ranges 300-1,000 ng/dl with natural decline of 1-2%?

Normal testosterone ranges 300-1,000 ng/dL with natural decline of 1-2% annually after age 30

What does the video say about clinical hypogonadism requires testosterone below 300 ng/dl plus symptoms, not?

Clinical hypogonadism requires testosterone below 300 ng/dL plus symptoms, not just suboptimal lifestyle habits

Sources & references

Citations extracted from our medical team's review. Click any citation to search PubMed.

Educational use only. This fact-check is editorial content for general information. Nothing here is medical advice. Talk to a licensed provider about your specific situation before starting, stopping, or changing any supplement, peptide, or medication regimen.

Read More on This Topic

Our written guides go deeper with dosing details, comparison tables, and medical-team reviewed protocols.

Not medical advice. This video was made by Dr. Stephen Cabral, Board Certified Doctor of Naturopathy, not by FormBlends. Our write-up above is an editorial review, not a medical recommendation. Talk to your doctor before making any decisions about medications or treatments.