DHT and Hair Loss: How Dihydrotestosterone Causes Thinning and What You Can Do About It

Medically reviewed by a GMC-registered doctor at The PRP Clinic | Last updated: February 2026

If you have spent any time researching hair loss, you have encountered three letters repeatedly: DHT. Dihydrotestosterone is described as the "enemy" of hair, the "cause" of baldness, and the hormone that "must be blocked" to save your hair.

But the reality is more nuanced than most articles suggest. Understanding exactly how DHT works, why it only affects certain follicles, and what your options are for managing its effects — without necessarily disrupting your hormonal balance — is essential for making informed treatment decisions.

This guide explains the biology in plain terms, addresses the most common questions, and outlines the full range of evidence-based approaches, from hormonal medications to regenerative treatments that work without altering your DHT levels at all.

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What DHT is and what it does

DHT is a hormone derived from testosterone. An enzyme called 5-alpha reductase converts approximately 5-10% of circulating testosterone into DHT. Despite being present in smaller quantities than testosterone, DHT is significantly more potent — it binds to androgen receptors approximately five times more strongly than testosterone.

DHT plays legitimate and important roles in the body. During foetal development, it is responsible for the formation of male genitalia. During puberty, it drives the deepening of the voice, growth of facial and body hair, development of the prostate, and other aspects of male maturation. In adulthood, DHT continues to support body hair growth, sexual function, and muscle development.

The problem — specifically for the scalp — is that while DHT stimulates body hair, it has the opposite effect on head hair in genetically susceptible individuals. This apparent paradox is known as the "DHT paradox" and is one of the more fascinating aspects of hair biology.

How DHT causes hair loss

The process by which DHT leads to hair loss is called follicular miniaturisation, and it happens in a specific, predictable sequence.

DHT circulates in the bloodstream and diffuses into the skin of the scalp. At susceptible follicles, DHT binds to androgen receptors in the dermal papilla — the control centre of the hair follicle. This binding triggers a cascade of molecular signals that gradually alter the follicle's behaviour.

The growth (anagen) phase becomes progressively shorter. Instead of growing for 2-7 years, the follicle may only sustain growth for weeks or months. The resting (telogen) phase may lengthen. The follicle itself physically shrinks, producing a thinner, shorter, less pigmented hair with each successive cycle. Over many cycles, what was once a thick, dark terminal hair becomes a fine, barely visible vellus hair. Eventually, the follicle may become so miniaturised that it ceases to produce visible hair altogether.

This process does not happen uniformly across the scalp. The follicles at the temples, frontal hairline, and crown are typically the most DHT-sensitive, which is why male pattern hair loss follows a predictable pattern (the Norwood scale). The follicles at the sides and back of the head are generally DHT-resistant, which is why these areas retain hair even in advanced balding — and why they serve as donor sites for hair transplants.

The role of genetics

Here is the critical point that many articles miss: DHT alone does not cause hair loss. The determining factor is how sensitive your follicles are to DHT, and this is genetically programmed.

Two men can have identical DHT levels. One may experience significant hair loss from his early twenties. The other may retain a full head of hair into his seventies. The difference is not their DHT — it is the androgen receptor sensitivity of their follicles, which is determined by the androgen receptor (AR) gene and other genetic variants.

This is why measuring DHT levels in isolation is not particularly useful for predicting or managing hair loss. A man with "normal" DHT can still lose hair rapidly if his follicles are highly sensitive. And reducing DHT does not guarantee results if genetic sensitivity is not the primary driver, or if other factors (nutritional deficiency, thyroid dysfunction, stress) are contributing.

Understanding your specific pattern of hair loss is the first step. Our doctors assess the cause and recommend treatment that targets the actual problem.

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Approaches to managing DHT-related hair loss

There are fundamentally two strategies: reduce DHT levels (hormonal approach) or strengthen follicles to resist DHT's effects (regenerative approach). Each has distinct advantages and limitations.

The hormonal approach: reducing DHT

Finasteride (Propecia) blocks the type II 5-alpha reductase enzyme, reducing scalp DHT by approximately 60-70%. It is effective (over 80% of men maintain hair with daily use) but requires lifelong medication and carries risks of sexual and mood-related side effects in a small percentage of users.

Dutasteride blocks both type I and type II 5-alpha reductase, reducing DHT more aggressively (by approximately 90%). It may be more effective than finasteride but carries a similar or slightly higher risk of side effects.

Natural DHT inhibitors including saw palmetto, pumpkin seed oil, and green tea (EGCG) mildly inhibit 5-alpha reductase. They are significantly weaker than pharmaceutical options and evidence of meaningful clinical benefit for hair loss is limited, though some studies show modest improvement.

The limitation of the hormonal approach is clear: DHT does useful things in the body, and reducing it systemically affects more than just the scalp.

The regenerative approach: strengthening follicles

PRP therapy works through an entirely different mechanism. Rather than reducing DHT, PRP delivers growth factors that stimulate follicle health, promote blood supply, reduce scalp inflammation, and support thicker hair production. In effect, PRP helps follicles function better despite DHT's presence.

This is a fundamental distinction. PRP does not manipulate hormones. It builds follicle resilience. Clinical studies have shown PRP can produce improvements in hair density comparable to finasteride — without any hormonal side effects.

Exosome therapy works similarly, delivering signalling molecules that promote follicle regeneration without hormonal intervention.

Nutritional optimisation — ensuring adequate iron, vitamin D, zinc, and other nutrients — supports follicle health and ensures they have the building blocks to respond to treatment.

The combination approach

Many patients benefit from combining elements of both strategies. Some use a low dose of finasteride alongside PRP and nutritional support. Others start with PRP and supplements alone, adding medication only if additional benefit is needed. The optimal approach depends on your specific pattern of loss, your tolerance for medication, your goals, and your individual biology.

What we recommend

At The PRP Clinic, we start by understanding your hair loss fully — through clinical examination, blood testing, and conversation about your history and goals. We then present all evidence-based options honestly, discuss the benefits and limitations of each, and support whatever decision you make.

For patients who prefer to avoid hormonal medication, PRP combined with nutritional optimisation provides a powerful, evidence-based approach. For those open to medication, we can discuss how PRP enhances the results of finasteride or minoxidil. The goal is always the best outcome for you as an individual.

Your hair loss has a cause. Let us identify it and build the right plan.

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Frequently asked questions

Does DHT cause hair loss?

DHT is the primary hormonal driver, but your genetic follicle sensitivity determines whether and how much hair you lose.

How can I reduce DHT naturally?

Saw palmetto, pumpkin seed oil, and green tea mildly inhibit DHT production. PRP offers a non-hormonal approach that strengthens follicles rather than reducing DHT.

Is high DHT always bad?

No. DHT plays important roles in male physiology. The issue is follicle sensitivity, not DHT levels alone.

Can DHT hair loss be reversed?

Yes, especially when caught early while follicles are still active. PRP, finasteride, and minoxidil can all produce improvement.

Do women have DHT hair loss?

Yes, though the pattern differs. PRP is often preferred for women as hormonal medications carry more limitations.

This article is for informational purposes only. Always consult a qualified healthcare professional.