Do testosterone levels really drop 1% per year after 40?

What did @doctorsood actually say?

The creator claims testosterone "starts declining in your 30s with an average drop of about 1% per year after 40," that modern men have lower levels than previous generations, and that a supplement called Solaray Testosterone Support can "support free and total testosterone levels" using ingredients like tongkat ali, fenugreek, zinc, and tribulus. The video is a paid partnership with Solaray, though this is disclosed at the end.

The framing is educational but the conclusion is a product pitch. That matters when you're evaluating whether the science is being presented accurately or selectively. To the creator's credit, they lead with lifestyle basics before the supplement. But calling this an "educational video" while promoting a specific brand requires scrutiny.

Does the science back this up?

The 1% annual decline figure is real and well-supported, but the "andropause starting at 30" framing oversimplifies a more complicated picture. The generational decline claim has real data behind it, but the supplement ingredients range from moderately supported to largely overhyped.

The 1% decline figure comes from longitudinal data including the Massachusetts Male Aging Study (Feldman et al., 2002, Journal of Clinical Endocrinology and Metabolism), which found total testosterone declined roughly 1.6% per year and free testosterone declined about 2-3% per year in aging men. So the creator's number is actually conservative, which is fair.

The generational decline claim draws on work by Travison et al. (2007, JCEM), who found population-level declines in testosterone independent of age, suggesting environmental or lifestyle factors. That finding is real, though causation remains debated.

On the supplement side: tongkat ali (Eurycoma longifolia) has some small trials suggesting modest testosterone support in deficient men (Tambi et al., 2012, Asian Journal of Andrology). Zinc deficiency does suppress testosterone, but supplementing above adequate levels shows no benefit. Fenugreek has mixed evidence. Tribulus has consistently failed to outperform placebo in well-controlled trials (Antonio et al., 2000, Journal of Strength and Conditioning Research).

What did they get wrong (or right)?

The lifestyle advice is solid. The andropause framing is misleading. The supplement claims are where things get shaky.

Calling age-related testosterone decline "men's version of menopause" is a common simplification that most endocrinologists push back on. Menopause involves a sharp, definitive hormonal shift. Male testosterone decline is gradual and highly variable. The American Urological Association doesn't recognize "andropause" as a clinical diagnosis for good reason.

The creator gets credit for recommending resistance training, sleep, protein, and stress reduction before pushing the supplement. That hierarchy is clinically appropriate. The Endocrine Society's guidelines on hypogonadism emphasize lifestyle modification as first-line management for borderline cases.

Where the video earns real skepticism: "tesner" from cocoa bean and pomegranate peel is branded by Gencor and has limited independent peer-reviewed data. The creator presents it as "research-backed" without specifying what that research actually shows or who funded it. That's a meaningful omission in a video with nearly a million views.

• Accurate: 1% annual decline after 40
• Accurate: generational decline in testosterone levels
• Misleading: "andropause" as a clinical equivalent to menopause
• Overstated: tribulus and "tesner" as testosterone support

What should you actually know?

If your testosterone is low enough to cause symptoms, a supplement is unlikely to meaningfully fix it. And if it isn't clinically low, the supplement probably won't do much either.

Clinically significant hypogonadism, defined by most guidelines as total testosterone below 300 ng/dL with symptoms, affects roughly 2-5% of men (Bhasin et al., 2010, JCEM). Suboptimal but not clinical testosterone levels occupy a much larger gray zone where lifestyle changes genuinely help and where supplement marketing thrives.

The ingredients with the most defensible evidence are zinc (if you're deficient) and tongkat ali (modest effect in some populations). Tribulus has failed repeatedly in controlled trials. "Plant-powered hormone free support" is a marketing phrase, not a clinical outcome.

If your symptoms are real and persistent, get a morning serum testosterone test from an actual provider before buying supplements. Symptoms like low libido, fatigue, and mood changes overlap with depression, thyroid dysfunction, sleep apnea, and dozens of other conditions that a supplement won't address. FormBlends connects you to licensed clinicians who can run actual labs and have that conversation with you.