Not medical advice

This article is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Symptune does not diagnose, treat, or provide clinical guidance. Always consult a qualified healthcare provider before making any changes to your protocol or treatment.

DHT comes up constantly in TRT discussions, usually in one of two contexts: hair loss anxiety, or as a vague explanation for why someone feels a certain way. Neither conversation tends to be very precise. Here's what the evidence actually shows.

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What DHT is

Dihydrotestosterone is a metabolite of testosterone. An enzyme called 5-alpha reductase converts testosterone to DHT in certain tissues - most notably the prostate, skin, hair follicles, and liver. DHT binds to androgen receptors more potently than testosterone and does not convert to estradiol.

DHT is responsible for several things associated with male development and physiology: body and facial hair growth, prostate development, and the progression of male pattern baldness in men who are genetically susceptible. What DHT does not do is behave like a simple amplifier of testosterone effects across the board. It acts differently depending on which tissue it's in, and its effects at elevated levels on TRT are not well-characterized in the research literature.

What happens to DHT on TRT

When you add exogenous testosterone, more substrate is available for 5-alpha reductase to work on. DHT levels typically rise in proportion to rising testosterone levels. How much depends on individual variation in 5-alpha reductase activity, which varies meaningfully between people.

Standard TRT lab panels do not include DHT. It's not part of a typical quarterly panel the way testosterone, estradiol, SHBG, and hematocrit are. If you want to check it, you need to specifically request it - it is available through direct-to-consumer testing.

Hair loss

This is the DHT effect men ask about most. Male pattern baldness (androgenetic alopecia) is driven by DHT acting on genetically susceptible hair follicles. If you carry the genes for pattern baldness, elevated DHT - whether from natural testosterone production or TRT - can accelerate the progression.

The key word is accelerate, not cause. TRT does not create hair loss susceptibility that wasn't already there. If you have no family history of male pattern baldness and have retained your hair into adulthood, TRT is unlikely to change that picture significantly. If you were already noticing thinning before TRT, or have a strong family history on both sides, TRT may speed that process along.

Men who want to address this sometimes use 5-alpha reductase inhibitors (finasteride or dutasteride) to lower DHT. This is the same class of medication used to treat benign prostatic hyperplasia. Whether to use one, and which one, is a decision for you and your prescribing clinician - there are real tradeoffs worth understanding before starting.

5-alpha reductase inhibitors and sexual side effects Finasteride and dutasteride lower DHT significantly. A subset of men report sexual side effects while on them - reduced libido, changes in erectile function, and mood effects. In most cases these resolve when the medication is stopped. A smaller number of men report symptoms that persist after discontinuation; this is discussed in the medical literature under the term "post-finasteride syndrome," though its mechanisms are not fully understood and research is ongoing. This is not a reason to avoid 5-ARIs categorically, but it is a reason to discuss the tradeoffs with your doctor rather than starting one unilaterally.

Prostate and DHT

DHT is a primary driver of prostate tissue growth. This is why 5-alpha reductase inhibitors are used to treat benign prostatic hyperplasia (BPH). Men on TRT tend to have higher DHT, which raises a reasonable question about prostate effects.

Current evidence does not establish that TRT at physiological replacement doses causes prostate cancer or clinically meaningful benign prostate growth in most men. However, men with existing prostate conditions - known or suspected prostate cancer, or significant BPH - require more careful clinical management on TRT. PSA monitoring is a standard part of TRT follow-up for this reason. If your clinician isn't including PSA in your regular panel, ask about it.

DHT and "androgenic feel"

A common claim in TRT communities is that DHT is responsible for libido, assertiveness, mood, and what people call the "androgenic feel" of a protocol. The evidence for this is limited and mixed. DHT does act in the brain, and some research suggests it plays a role in certain aspects of mood and cognition, but the picture is incomplete.

Attributing specific subjective experiences to DHT specifically - as opposed to free testosterone, estradiol, or other variables - is not something the current literature supports confidently. If your libido or mood is a problem on TRT, DHT is usually not the first variable to investigate. Estradiol balance and free testosterone are better-supported levers for those symptoms.

Should you test DHT?

For most men on standard TRT, DHT testing adds limited value to routine monitoring. You can't directly intervene on DHT without a 5-ARI, and the main reasons to consider one (hair loss, prostate symptoms) are better evaluated by their own clinical signs than by a DHT number alone.

The situations where testing DHT makes sense: you're considering a 5-ARI and want a baseline, you're experiencing significant scalp hair loss and want to understand your androgen picture more fully, or your clinician has a specific clinical reason. In those cases it's a straightforward lab add-on.

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