What is the best DHT Blocker According to a Derm?

Table of Content:
What is a DHT blocker? | How do they work? | Do you need a prescription? | How to get a prescription? | Strongest DHT Blocker | Oral DHT Blockers | Topical DHT Blockers | DHT Blocker Supplements | About DHT | FAQ

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Noticing thinning hair or a receding hairline—and wondering which DHT blocker actually works?

You’re not alone. DHT (dihydrotestosterone) is one of the main causes of pattern hair loss—but with so many options available, from shampoos to prescription medications, it’s hard to know what’s effective and what’s just marketing.

Here’s the truth: not all DHT blockers are created equal. Some can slow hair loss, others can help regrow hair—and some have little to no real impact at all.

Choosing the wrong option can cost you time, money, and most importantly your hair.

That’s why getting the right treatment early matters.

With Miiskin, you can get a personalized hair loss treatment plan (including prescription DHT blockers when appropriate) reviewed by a board-certified dermatologist online.

A tailored approach helps you choose the right treatment based on your hair loss pattern, stage, and goals—so you don’t waste months on ineffective solutions.

What is a DHT blocker?

Dr. Eric Howell, board-certified dermatologist says that DHT blockers are substances that inhibit the action of dihydrotestosterone (DHT), a hormone derived from testosterone that is linked to hair loss in conditions like androgenetic alopecia (male and female pattern baldness). By blocking DHT, these substances can help prevent hair follicles from shrinking and potentially promote hair growth¹.

How do DHT blockers work?

Dr. Howell says that DHT blockers work by inhibiting the enzyme 5-alpha-reductase, which is responsible for converting testosterone into DHT. By reducing DHT levels in the scalp, these blockers can help reduce hair follicle shrinkage and the associated hair loss³.

Do you need a prescription for a DHT blocker?

Prescription-strength DHT blockers like finasteride and dutasteride in oral or topical form require a prescription. DHT blocker supplements, such as saw palmetto, do not require a prescription and can be purchased over-the-counter.

Dr. Howell says that if you have taken DHT blocker supplements and did not get the results you were hoping for, then you should have a photo-consultation with a board-certified dermatologist and request a prescription for an oral or topical DHT blocker.

* Finasteride and Dutasteride cannot be used by women.

How to get a prescription for a DHT blocker?

You can get a prescription for finasteride a prescription-strength DHT blocker by having a consultation with a board-certified dermatologist via Miiskin for only $59. If you choose Foothills as your preferred pharmacy, you can have your medication delivered to your doorstep, no subscription needed. Consultation price is $39 – $59.

What are the best DHT blockers?

For androgenetic alopecia (pattern hair loss), the best-studied DHT blockers are prescription 5-alpha-reductase inhibitors such as finasteride and dutasteride. Dutasteride suppresses DHT more strongly and some studies suggest it can be more effective than finasteride, although the appropriate treatment depends on the individual. Natural options such as saw palmetto and pumpkin seed oil have also shown potential benefits for hair loss, but the evidence is more limited and they should not be considered equivalent to prescription DHT blockers ^{6 7  8} .

What is the strongest DHT blocker for men’s hair loss?

Dr. Howell explains that dutasteride is the most potent prescription DHT blocker currently available. It inhibits both type I and type II 5-alpha-reductase enzymes and can reduce circulating DHT levels by more than 90%. Finasteride primarily inhibits type II 5-alpha-reductase and reduces circulating DHT by approximately 60–70%. This stronger DHT suppression can make dutasteride an effective treatment for androgenetic alopecia (male pattern hair loss). However, dutasteride is not FDA-approved for hair loss in the U.S. and is prescribed off-label for this purpose.

Oral DHT blockers

Finasteride (Propecia, Proscar)

• Mechanism: Inhibits Type II 5α-reductase, reducing scalp and serum DHT by ~60–70%.
• Prescription medication FDA-approved for male pattern hair loss.
• Side effects (rare): sexual dysfunction, low mood, reduced libido⁹.

Dutasteride (Avodart)

• Mechanism: Inhibits both Type I and Type II 5α-reductase, reducing DHT by >90%.
• Prescription medication that is more potent than finasteride and sometimes prescribed off-label for hair loss.
• Similar side effect profile, but potentially more effective^10.

Topical DHT Blockers

Topical finasteride or topical dutasteride (available only as compounded formulas)

• Developed to reduce systemic side-effects of the oral medications
• Applied directly to the scalp.
• Can lower scalp DHT with much less impact on blood levels.

Ketoconazole shampoo 2%

• Antifungal with mild anti-androgenic effects.
• Often used 2–3 times a week as an adjunct therapy.

Best supplements to block DHT (non-prescription)

According to Dr. Howell, these DHT blockers are usually less effective than prescription options but may help for mild cases or in combination.

• Saw Palmetto – mild 5α-reductase inhibitor, some studies may suggest a mild benefit.
• Pumpkin Seed Oil – shown in limited trials to improve hair density.
• Green Tea Extract (EGCG) – may reduce DHT activity locally.
• Stinging Nettle Root – weak evidence, sometimes included in herbal blends.
  

Are DHT blockers taken by mouth?

Yes, some DHT blockers are taken orally, such as finasteride, dutasteride and saw palmetto capsules. 

What is the best DHT blocker for women?

Dr. Howell explains that spironolactone is a commonly prescribed anti-androgen for women with androgenetic alopecia (female pattern hair loss). Rather than directly blocking DHT production, spironolactone primarily works by blocking androgen receptors and reducing the effects of androgens on hair follicles. This can help slow hair loss and promote hair growth in some women, particularly when androgen activity contributes to their hair loss.

About DHT

What is DHT?

Dr. Howell says that dihydrotestosterone (DHT) is a hormone derived from testosterone, which is a key androgen hormone that plays a crucial role in the development of male characteristics. DHT is created from testosterone by the action of an enzyme called 5-alpha-reductase. This transformation occurs in various tissues throughout the body including the skin, liver, and prostate.

DHT is crucial for male sexual development. It helps differentiate sexual organs of the fetus and continues to influence bodily changes like prostate growth and hair development during adolescence and adulthood.  It’s involved in the development of male sexual characteristics during puberty, such as facial hair, body hair, and the growth of the prostate. In adults, DHT supports male sex drive and helps maintain muscle mass.

However, DHT is also implicated in certain health issues. It’s known to be a contributing factor in the development of conditions like androgenetic alopecia (male pattern baldness) and benign prostatic hyperplasia (BPH). This is why medications that inhibit the production of DHT, such as finasteride and dutasteride, are used to treat these conditions. They work by blocking the activity of the enzyme 5-alpha-reductase, thereby reducing the production of DHT^{12 13}.

What does DHT do?

Dihydrotestosterone (DHT) has several important functions in the body:

Development of male characteristics: DHT is crucial for the development of male sexual characteristics during puberty. This includes the growth of facial and body hair, deepening of the voice, and development of the genitals.

Skin, hair, and prostate health: DHT acts on the skin and is involved in the production of body and facial hair. It also plays a significant role in the health and enlargement of the prostate gland. High levels of DHT can contribute to benign prostatic hyperplasia (BPH), which is an enlargement of the prostate gland.

Hair follicle health: DHT binds to receptors in hair follicles and can cause them to shrink, which affects their ability to sustain normal hair growth. This action is a primary cause of androgenetic alopecia, or male pattern baldness.

Sebaceous gland activity: DHT influences the activity of sebaceous glands in the skin, which produce oil. This can affect skin conditions such as acne.

Muscle maintenance: DHT is thought to help maintain muscle mass and contribute to muscle growth, strength, and function^{14 15} .

Frequently asked questions about DHT Blockers

What is the best DHT blocker shampoo?

Dr. Howell says that the best DHT blocker shampoo typically depends on individual needs and responses, but popular options often include those containing ketoconazole, saw palmetto, or other herbal extracts known for their DHT-blocking properties. These shampoos are marketed to reduce hair loss and support hair growth by reducing scalp DHT levels. When choosing a shampoo, it’s important to consider personal hair type, scalp sensitivity, and specific hair concerns.

Is blocking DHT harmful?

Dr. Howell says that blocking DHT can be advantageous for treating conditions like male pattern baldness and benign prostatic hyperplasia, where DHT’s role is detrimental. 

However, the use of DHT blockers is associated with potential side effects. These can include sexual dysfunction, characterized by reduced libido, erectile dysfunction, lower ejaculate volume, mood changes, and could have an impact on muscle mass. The severity and frequency of these side effects vary significantly among individuals, with some experiencing minimal effects and others finding the side effects severe enough to stop treatment. This variability makes it important for individuals considering DHT blockers to consult healthcare professionals and carefully weigh the benefits against the potential risks.

What is a natural DHT blocker?

Dr. Howell says that natural DHT blockers include substances like saw palmetto, pumpkin seeds, and green tea, coconut oil, onions, turmeric, and edamame beans are believed to reduce the production of DHT naturally¹⁶.

How to reduce DHT naturally?

Dr. Howell says that to reduce DHT levels naturally, you can consider dietary changes and supplements such as saw palmetto, green tea, pumpkin seeds, and foods rich in zinc. Regular exercise and maintaining a healthy diet can also help.

Will reducing DHT regrow hair?

Dr. Howell says that reducing DHT can help stop the progression of hair loss and potentially regrow hair, particularly in those with androgenetic alopecia. However, if you stop taking the medication, hair loss will resume, therefore the hair loss will only stop as long as you stay on the medication. 

Can dutasteride and finasteride regrow hair?

Yes, both dutasteride and finasteride can regrow hair by blocking DHT. Dutasteride is generally more potent, inhibiting more DHT, which may lead to better results in some cases.

Does coffee block DHT?

Dr. Howell says that there is some evidence suggesting that the topical application of caffeine, which is found in coffee, can help block DHT and stimulate hair growth when applied topically. However, drinking coffee is unlikely to have a significant impact on DHT levels¹⁷.

Does zinc block DHT?

Zinc is thought to inhibit the enzyme that converts testosterone to DHT, making it a potential natural DHT blocker. However, more research is needed to fully understand its effectiveness.

What reduces DHT the most?

Dr. Howell says that prescription-strength DHT blockers like finasteride and dutasteride are the most effective at reducing DHT levels and are commonly used in the treatment of hair loss. You can get a prescription by having a photo-consultation via Miiskin.

How to know if DHT is high?

Dr. Howell says that high DHT levels may manifest as increased hair loss, acne, and in some cases, an enlarged prostate in men. A blood test is the most accurate way to measure DHT levels.

Does exercise reduce DHT?

Dr. Howell says that regular exercise is believed to help reduce DHT levels by improving blood circulation and balancing hormone levels, including testosterone which is a precursor to DHT.

How to check DHT level at home?

Dr. Howell says that it is not possible to check your DHT levels at home as you need a blood test to accurately measure DHT levels.

Does DHT build muscle?

Dr. Howell says that DHT is a potent androgen and plays a role in muscle maintenance and development, but it is not typically used directly for building muscle due to its effects on hair loss and prostate growth.

Do DHT blockers affect testosterone?

Dr. Howell says that systemic DHT blockers can affect overall hormone balance. They primarily reduce DHT levels without significantly reducing testosterone levels, but some impact on overall androgen activity can occur.

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