TRT claims on TikTok: what the testosterone science actually shows

What did @drleprovost actually say?

The core claim here is straightforward: young men (under 35-40) showing symptoms like fatigue, weight gain, low libido, and weaker erections should get LH and FSH tested alongside standard hormone panels before starting testosterone therapy. He framed LH and FSH as diagnostic tools that reveal whether low testosterone is coming from the testes themselves or from a signaling failure higher up the chain, specifically the pituitary gland.

He also described the negative feedback loop accurately: as testosterone rises, the brain dials back LH and FSH production. When testosterone is low, LH and FSH should climb in response. This distinction, he argued, separates primary from secondary hypogonadism. His recommended panel included total and free testosterone, sex hormone binding globulin (SHBG), estrogen, DHEA, LH, FSH, a complete blood count (CBC), and a comprehensive metabolic panel (CMP).

Does the science back this up?

Yes, largely. The clinical logic here is solid and matches published endocrinology guidelines. The American Urological Association's 2018 guidelines on testosterone deficiency explicitly recommend measuring LH and FSH when hypogonadism is suspected, precisely because it differentiates primary from secondary causes. That distinction is not academic, it changes the treatment entirely.

The HPG (hypothalamic-pituitary-gonadal) axis feedback loop he described is textbook endocrinology. When LH and FSH are elevated alongside low testosterone, that points to primary hypogonadism, meaning the testes are failing to respond. When LH and FSH are low or normal despite low testosterone, that suggests secondary hypogonadism, a pituitary or hypothalamic problem. Bhasin et al. (2010, Journal of Clinical Endocrinology and Metabolism) laid out this diagnostic framework clearly, and it has not changed meaningfully since. Including SHBG is also clinically relevant because it affects how much testosterone is actually bioavailable. Travison et al. (2017, JCEM) confirmed SHBG's role in interpreting total testosterone numbers accurately.

What did they get wrong (or right)?

Credit where it is due: the diagnostic framework is correct, and recommending this testing before starting TRT is genuinely good practice that many clinics skip. The insistence on testing first, especially in young men, is the right instinct. A 30-year-old with low testosterone and elevated LH might have Klinefelter syndrome or another condition that TRT alone does not address. Jumping straight to treatment without this workup is a clinical shortcut that can mask serious underlying pathology.

Where the video gets loose: he mentioned DHEA as part of the panel without explaining why or what clinicians do with that number clinically. DHEA-S testing is useful for ruling out adrenal issues, but it is not a standard first-line hypogonadism marker per major guidelines. Calling it out without context could lead viewers to demand tests that add cost without necessarily changing clinical decisions. He also used the phrase "biofeedback mechanism" when the correct term is negative feedback. Minor, but precision matters when you're explaining physiology to patients who may then push back on their own doctors using imprecise language.

What should you actually know?

If you're a younger man worried about testosterone levels, the most important takeaway from this video is actually buried: not all low testosterone is the same, and the cause matters. A 32-year-old with secondary hypogonadism caused by a pituitary adenoma needs imaging, not a testosterone prescription. A man with primary hypogonadism may still benefit from TRT, but fertility implications are completely different and deserve a conversation.

The AUA and Endocrine Society both recommend confirming low testosterone on at least two morning measurements before any diagnosis. Testosterone levels fluctuate. One low reading, especially in the afternoon, does not a diagnosis make. Welliver et al. (2014, Journal of Urology) found that nearly 30% of men with a single low testosterone reading had normal levels on repeat testing.

• Primary hypogonadism means the testes are the problem. LH and FSH will be high.
• Secondary hypogonadism means the brain-pituitary signal is the problem. LH and FSH will be low or inappropriately normal.
• TRT suppresses your own LH and FSH, which shuts down natural testosterone and sperm production. Young men who want biological children need to know this before starting.
• SHBG levels affect how much testosterone is actually usable. High SHBG can make normal total testosterone clinically insufficient.

A full panel including LH, FSH, SHBG, and estradiol is reasonable to request. That part of the advice is genuinely useful. Just make sure you're working with a clinician who acts on the results rather than treating everyone with the same protocol regardless of what they show.