What Is DHT (Dihydrotestosterone) and How It Causes Hair Loss?

DHT is a key hormone that can shrink sensitive follicles, causing hair thinning and baldness in predisposed people.

Dr. Nadiye HACIÖMEROĞLUPhysician

12 min read

February 3, 2026

What Is DHT (Dihydrotestosterone) and How It Causes Hair Loss?

DHT, or dihydrotestosterone, is a hormone derived from testosterone that plays a role in several biological processes within the body. It is also closely associated with certain types of hair loss, particularly androgenetic alopecia. In genetically susceptible individuals, DHT can affect hair follicles over time, contributing to progressive thinning and reduced hair density. Understanding how DHT interacts with hair follicles can help explain the development of pattern hair loss and provide context for treatment approaches designed to reduce its effects on the scalp.

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What Is DHT (Dihydrotestosterone)?

Dihydrotestosterone (DHT) is a potent androgen, a type of hormone involved in the development and regulation of male characteristics. DHT is produced when testosterone is converted by an enzyme known as 5-alpha reductase. Although testosterone performs many important functions throughout the body, DHT has a stronger effect on certain tissues due to its higher binding affinity to androgen receptors.

How Dihydrotestosterone Is Produced in the Body?

Dihydrotestosterone is produced when testosterone is converted by the enzyme 5-alpha reductase. This enzyme is found in several tissues throughout the body, including the skin, prostate, liver, and hair follicles. The activity of 5-alpha reductase can vary between individuals due to genetic and hormonal factors.

After conversion, DHT becomes a more biologically active androgen. It binds strongly to androgen receptors within cells and influences a variety of physiological processes. During puberty and adulthood, DHT contributes to the development of male secondary sexual characteristics, body hair growth, and prostate development.

In individuals who are genetically susceptible to androgenetic alopecia, DHT can affect scalp hair follicles differently. Over time, exposure to DHT may contribute to follicle miniaturization, a process in which follicles gradually become smaller and produce finer, shorter hairs. This progressive change is considered one of the primary mechanisms involved in pattern hair loss.

The Role of DHT in Men and Women

In men, DHT is essential during puberty for the development of male characteristics like a deeper voice, facial hair, and increased muscle mass. However, high sensitivity to DHT in the scalp can lead to male pattern baldness later in life. Women also produce Dihydrotestosterone , but in much smaller amounts. Elevated levels of this hormone in women can contribute to hair thinning, acne, and other hormonal imbalances.

How DHT Affects Hair Follicles?

Hair follicles naturally move through repeating growth cycles that include growth, resting, and shedding phases. In individuals who are genetically sensitive to DHT, this hormone can interfere with the normal cycle by affecting susceptible scalp follicles, particularly in areas such as the hairline and crown.

Over time, affected follicles may become progressively smaller and produce finer, shorter, and less pigmented hairs. This process, known as follicular miniaturization, can gradually reduce hair density and visible coverage. As miniaturization continues, some follicles may eventually stop producing visible hair altogether.

Follicular miniaturization is considered a key mechanism in androgenetic alopecia, also known as pattern hair loss.

Other Effects of Dihydrotestosterone in the Body

Beyond its role in hair biology, DHT is involved in several important physiological processes. It contributes to the development and maintenance of certain male characteristics, influences sebaceous gland activity in the skin, and plays a role in prostate growth and function.

Because DHT affects multiple tissues throughout the body, changes in its activity have been associated with several health conditions. Increased DHT activity has been linked to androgenetic alopecia, while it may also contribute to conditions such as Benign Prostatic Hyperplasia (BPH) and acne in susceptible individuals.

Although DHT is often discussed in relation to hair loss, it remains a naturally occurring hormone with important biological functions throughout life.

What Is DHT Blocker and How Does It help Hair Loss?

A DHT blocker is a treatment, medication, ingredient, or compound that aims to reduce the effects of dihydrotestosterone (DHT) on hair follicles or decrease its production within the body. Because DHT is closely associated with androgenetic alopecia, DHT-blocking approaches are commonly used in hair loss management strategies.

DHT Blocker Medications

Prescription medications such as Finasteride and Dutasteride are among the most widely studied DHT-lowering treatments. These medications work by inhibiting the enzyme 5-alpha reductase, which is responsible for converting testosterone into DHT.

By reducing DHT levels, these treatments may help slow follicle miniaturization and support the preservation of existing hair. Because they can have potential side effects and are not appropriate for everyone, medical supervision is recommended.

DHT Blocker Shampoos

DHT-focused shampoos are topical products formulated to support scalp health and complement broader hair loss treatment plans. Common ingredients include ketoconazole, saw palmetto, pumpkin seed oil, and caffeine.

Although shampoos generally do not reduce DHT to the same degree as prescription medications, they may help support scalp health and contribute to an overall hair care regimen.

Natural DHT Blockers and Supplements

Several plant-based ingredients are commonly promoted as natural DHT blockers. Examples include saw palmetto, green tea extract, stinging nettle, and pygeum bark.

These ingredients are frequently included in hair health supplements and may be used alongside other treatment approaches. While some research has explored their potential effects, the scientific evidence supporting these substances is generally less extensive than the evidence available for prescription DHT-lowering medications.

When to See a Doctor About Hair Loss?

Hair loss is not always caused by DHT. Factors such as stress, nutritional deficiencies, thyroid disorders, hormonal imbalances, certain medications, and underlying medical conditions can also contribute to hair thinning and shedding.

If you experience rapid hair loss, patchy bald areas, excessive shedding, or noticeable thinning at a young age, a medical evaluation may help identify the underlying cause. A healthcare professional or dermatologist can assess your scalp, review your medical history, and recommend appropriate diagnostic tests when necessary.

Determining whether DHT is involved is an important step in developing an effective treatment plan, as different causes of hair loss often require different management approaches.