TRT and DHT: what the evidence says about the conversion concern

What did @therestoreclinic actually say?

The creator made three core arguments: first, that hair loss on TRT is "a genetic thing" and DHT is only one factor; second, that serum DHT levels "don't provide a whole lot of clinical merit"; and third, that DHT works primarily as a tissue hormone, what they called an "intracron hormone." They drew a parallel to serum estradiol, suggesting both markers are similarly unreliable in blood tests. The framing was reassuring, aimed at TRT users anxious about DHT and hair loss. That reassurance is partially earned, but the reasoning has some gaps worth unpacking.

Does the science back this up?

On the genetics of hair loss, they're largely correct. Androgenetic alopecia is driven by genetic sensitivity of hair follicles to DHT, not by circulating DHT levels alone. A 2017 review by Trüeb in the International Journal of Trichology confirmed that follicle sensitivity to androgens, encoded largely by androgen receptor gene variants, explains why DHT levels correlate poorly with hair loss severity across individuals. You can have low serum DHT and still lose hair aggressively if your follicles are genetically primed to respond. That part holds up.

The claim about serum DHT lacking clinical utility is more complicated. DHT is produced locally in tissues like the prostate, scalp, and liver via 5-alpha reductase enzymes, and serum levels genuinely do not capture that local synthesis well. A 2003 study by Rittmaster in the Journal of Clinical Endocrinology and Metabolism noted that tissue DHT concentrations can diverge significantly from serum measurements. So there's real science behind the skepticism. However, serum DHT is not entirely useless. It's used clinically to evaluate 5-alpha reductase deficiency and monitor finasteride response, among other things.

What did they get wrong (or right)?

The term "intracron hormone" is not standard clinical terminology. They likely meant "intracrine," which describes hormones that are synthesized and act within the same cell without entering circulation. DHT does exhibit intracrine activity in tissues like the prostate and hair follicle, and this is well-documented. A 2000 paper by Labrie et al. in the Journal of Steroid Biochemistry and Molecular Biology described intracrine androgen action in detail. So the concept is real, the word just came out garbled on camera.

Where they overreach is in the parallel drawn between serum DHT and serum estradiol. Estradiol monitoring on TRT has its own debate, but dismissing both in the same breath flattens important differences. Serum estradiol does predict symptoms like gynecomastia risk to some degree. Lumping these two together without nuance could lead patients to dismiss monitoring conversations with their providers entirely, which is the wrong takeaway.

What they got right: the core message that DHT-anxiety in TRT patients is often disproportionate is reasonable. Clinicians who see patients stopping TRT purely over DHT fear, without evidence of hair loss or symptoms, would likely agree the worry is often outsized.

What should you actually know?

DHT is a potent androgen derived from testosterone via 5-alpha reductase. TRT does raise DHT, typically more with injections than with transdermal gels, because systemic testosterone elevation drives more conversion. Whether that matters for your hair comes down to your androgen receptor gene variants, specifically the AR gene on the X chromosome, which is why maternal grandfather hair is still your best crude predictor.

Serum DHT has real but limited uses. It is not a reliable proxy for tissue exposure, but it is not meaningless either. If you are taking a 5-alpha reductase inhibitor like finasteride alongside TRT, your provider may still want to track serum DHT as one data point among several.

• Hair loss on TRT is not inevitable, and DHT alone does not determine your outcome.
• If hair loss is a concern, the conversation with your provider should be about your family history and whether a 5-alpha reductase inhibitor is appropriate, not just your serum DHT number.
• Do not stop or alter your TRT protocol based on DHT lab values alone without speaking to your prescribing clinician.