When to start TRT: what the science says vs. TikTok

What did @kmartfit actually say?

The creator argued that TRT eligibility is not about age but about symptoms and blood levels, which is a reasonable starting point. The specific claim that matters here: if your total testosterone comes back "lower than 550," their clinic will write a prescription. They also said TRT has "not a lot to do with age," citing conversations with men from their 20s to their 80s who are using it. That last part deserves scrutiny.

To be fair, the creator is describing one clinic's policy, not a universal medical standard. But presenting a single clinic's intake threshold as though it's a legitimate clinical benchmark is where this gets slippery. The 550 ng/dL number sounds precise. It isn't.

Does the science back this up?

Partially, but not in the way the video implies. Clinical guidelines from the American Urological Association and the Endocrine Society define hypogonadism using a threshold closer to 300 ng/dL for total testosterone, confirmed on two separate morning measurements. The Endocrine Society's 2018 guidelines (Bhasin et al., Journal of Clinical Endocrinology and Metabolism) are explicit: TRT is indicated for men with consistently low levels and symptoms, not based on a single draw against an arbitrary cutoff.

The 550 ng/dL figure sits well within the normal reference range for most labs, which typically runs from 264 to 916 ng/dL. Treating a man at 540 ng/dL without clear clinical hypogonadism is not standard of care. It reflects a growing trend in commercial telehealth toward broader prescribing, which some researchers have flagged as overtreatment.

What did they get wrong (or right)?

They got the broad strokes right: age alone is not a disqualifying factor for TRT, and symptom assessment alongside bloodwork matters. A 2020 review in the Journal of Urology (Mulhall et al.) confirmed that symptoms like fatigue, reduced libido, and mood changes should be evaluated alongside lab values, not replaced by them.

What they got wrong is the 550 threshold. Presenting a single commercial clinic's intake cutoff as a meaningful benchmark is misleading. A man at 520 ng/dL with no symptoms does not have hypogonadism under any major clinical guideline. The creator may not have intended to mislead, but broadcasting this number to 15,000 viewers without that context does real harm. It sets an expectation that a normal testosterone level is grounds for treatment.

The call-to-action at the end, asking viewers to comment "TRT" to receive referral information, also crosses into promotional territory that blurs the line between health content and advertising for the creator's affiliated clinic.

What should you actually know?

If you are curious about TRT, the starting point is two morning blood draws on separate days, not one number from one clinic's marketing policy. Total testosterone is also only part of the picture. Free testosterone, sex hormone-binding globulin (SHBG), LH, and FSH levels all matter for understanding why your testosterone is low, and that reason changes what treatment, if any, is appropriate.

For younger men especially, starting TRT without understanding the cause of low T can mask treatable conditions like pituitary issues or be premature if the cause is lifestyle-related. A 2019 study in Fertility and Sterility (Tatem et al.) specifically flagged exogenous testosterone in young men as a significant cause of infertility that is often not discussed upfront.

The creator's point about age not being a hard barrier is defensible. But the 550 threshold is a commercial policy, not a clinical standard. Know the difference before you start anything.