DHT Imbalance and Male Sexual Health: Genetic Factors

This article is part of the PlexusDx Education Hub — your resource for evidence-based guidance on hormones & fertility. Browse all Hormones & Fertility education

Dihydrotestosterone, or DHT, is the most potent androgen in the male body. It is made from testosterone and drives many of the traits associated with male development — but its influence does not end at puberty. Throughout life, DHT shapes prostate biology, hair follicles, libido, and aspects of sexual function. When DHT runs too high or too low for a given person, the effects can show up across several of these systems. And how much DHT you make, and how your tissues respond to it, is strongly influenced by your genes.

What DHT does in the body

DHT binds the androgen receptor more tightly than testosterone does, making it the stronger signal in the tissues where it accumulates. It supports libido and sexual function, contributes to prostate growth, and acts on hair follicles — where, paradoxically, it drives beard growth but can shrink scalp follicles in genetically susceptible men. Because DHT is so potent, small shifts in how much is produced or how strongly it is sensed can have outsized effects.

The SRD5A2 gene and DHT production

The conversion of testosterone into DHT is carried out by the enzyme 5-alpha reductase, and its type 2 form is encoded by the SRD5A2 gene. Variants in SRD5A2 influence how efficiently this conversion happens. More active versions can mean relatively higher DHT signaling in target tissues, while less active versions shift the balance the other way. This is a clear example of how a single gene sets the baseline for a hormone's local effect — the same testosterone level can produce different amounts of DHT depending on your SRD5A2 profile.

The androgen receptor and tissue sensitivity

Production is only half the story; sensitivity is the other half. The androgen receptor gene, AR, contains a repeating CAG sequence whose length affects receptor activity. Shorter repeats are generally associated with a more responsive receptor, meaning tissues react more strongly to the same amount of DHT, while longer repeats tend to blunt the response. This is why two men with identical hormone lab values can experience androgen effects — on hair, prostate, and libido — quite differently.

Signs of DHT imbalance and general management

Because DHT touches multiple systems, an imbalance can show up as changes in libido, sexual function, scalp hair thinning, or prostate-related symptoms. These signs are nonspecific and overlap with many other causes, so they warrant evaluation by a qualified healthcare provider rather than self-interpretation. General, evidence-based wellness factors — maintaining a healthy body composition, managing stress, sleeping well, and staying physically active — support balanced hormone function, but any concern about symptoms belongs in a clinical conversation.

What your genetic insights reveal

Pathway-level genetic testing does not diagnose a hormone disorder or prescribe a treatment. It maps how your genes influence androgen-related pathways, including production and receptor sensitivity. The Precision Peptide Genetic Test analyzes 14 pathways, 49 peptides, 150+ genetic insights, placing genes like SRD5A2 and AR in the context of the hormonal pathways they shape. That insight helps explain your baseline biology and supports a more productive conversation with your provider — genetics as a guide, not a guarantee.

Curious how your own genetics shape these pathways? The Precision Peptide Genetic Test reads your DNA at the pathway level — genetics as a guide, not a guarantee — so you can turn guesswork into an informed conversation with a qualified provider.

Frequently Asked Questions

What causes DHT levels to differ between men?

DHT differences come from both production and sensitivity. The SRD5A2 gene controls the 5-alpha reductase enzyme that converts testosterone to DHT, so its variants influence how much DHT you make. The AR gene's CAG repeat length then determines how strongly your tissues respond to it. Genetics sets much of this baseline.

Can genetic testing diagnose a DHT imbalance?

No. Genetic testing provides pathway-level insight into how your genes influence androgen production and sensitivity — not a diagnosis. Symptoms like low libido or hair thinning have many causes and should be evaluated by a qualified healthcare provider using appropriate labs and clinical assessment, not genetics alone.

Does the AR gene affect hair loss and libido?

Indirectly, yes. The androgen receptor gene's CAG repeat length influences how sensitively tissues respond to DHT, which affects androgen-driven traits including scalp follicles and libido. It is one of several genetic factors, and it does not by itself determine outcomes — hormones, lifestyle, and overall health all contribute.

This article is part of the PlexusDx Education Hub. Browse all Hormones & Fertility education

The Precision Peptide Genetic Test analyzes how your genes influence peptide-related biological pathways. It does not recommend, prescribe, or determine which peptides you should use. Consult a qualified healthcare provider before beginning any peptide protocol.