In the world of hair loss, one name keeps resurfacing: dihydrotestosterone. Derived from testosterone, this hormone is naturally produced by your body and plays a role in several biological functions. Yet for some, it becomes one of the main drivers behind androgenetic alopecia.
In this article, we’ll look at how DHT interacts with your hair, why you may be more sensitive to it than someone else, and what options actually exist to manage its impact.
What is dihydrotestosterone?
Dihydrotestosterone, more commonly known as DHT, is a potent androgen hormone. Your body produces it naturally, in both men and women, and it plays a role in the development of male characteristics, including body and facial hair.
It’s not a “more concentrated” form of testosterone, but a more active one. DHT is formed when testosterone is converted by an enzyme called 5-alpha reductase—a process that slightly alters its structure and makes it bind more strongly to androgen receptors.
During puberty, this increased activity contributes to changes such as the growth of facial and body hair, a deeper voice, and the maturation of the male reproductive system.
If you’re curious about the term itself, “dihydrotestosterone” comes from a mix of Greek and Latin roots. “Di-” means two, and “hydro” refers to hydrogen. Together, “dihydro” points to the presence of two hydrogen atoms in the molecule. “Testosterone” comes from the Latin “testis,” meaning testicle, combined with a suffix used for steroid hormones.
Taken literally, the name suggests a version of testosterone with two additional hydrogen atoms. It’s a useful detail from a language perspective, but it doesn’t fully explain how DHT works in the body.
How does DHT affect hair loss?
While DHT is essential for normal physiological functions, it has also been linked to conditions such as benign prostate enlargement and androgenetic alopecia in both men and women. That said, it’s not simply a matter of having “too much” DHT. What matters most is how sensitive your hair follicles are to it.
When DHT binds to hair follicles, it gradually causes them to shrink—a process known as miniaturization. Over time, continued exposure can reduce these follicles to the point where they can no longer produce visible hair. This is what leads to the progressive thinning seen in androgenetic alopecia.
In men, this often shows up as a receding hairline and thinning at the crown. In women, it tends to appear as a more diffuse thinning across the scalp.
The way DHT affects your hair isn’t the same for everyone. Genetics play a central role, so if hair loss runs in your family, you’re more likely to experience it yourself.
Other factors—like your overall health, nutrition, or lifestyle—can influence the condition of your hair, but they don’t override how your follicles respond to DHT.
The various DHT inhibitors and blockers
In the hair loss space, the terms “DHT inhibitor” and “DHT blocker” are often used interchangeably. In practice, though, they don’t always refer to the same mechanism.
What’s the difference between a DHT inhibitor and a DHT blocker?
A DHT inhibitor works by reducing the production of DHT. It targets the enzyme 5-alpha-reductase, which is responsible for converting testosterone into DHT. By lowering overall DHT levels, these treatments aim to limit its effect on your hair follicles and slow the progression of hair loss. They are most commonly used in oral form, although some topical versions exist.
The term “DHT blocker” is broader and less clearly defined. It’s often used to describe products that aim to interfere with DHT at the scalp level—whether by reducing its local activity or limiting how it interacts with your hair follicles. In most cases, these come in the form of shampoos, serums, or lotions.
A présent voici une liste non-exhaustive d’inhibiteurs de DHT :
The inhibitors listed below are the most widely used products known for their action against hair loss. However, although they are effective, taking them may have side effects. Please ask your doctor for advice:
- Finasteride
- Dutasteride
- Bicalumatide
- Flutamide
- Spironolactone
Let’s move on to natural options that are often discussed for their potential effect on DHT. While some of these ingredients have shown mild or indirect activity in research, they don’t match the effectiveness of medical treatments designed to target DHT.
That said, they are generally better tolerated and may be used as supportive additions, depending on your approach.
- Green tea extract
- Saw palmetto
- Azelaic acid
- Rosemary oil
To continue, here’s a non-exhaustive list of ingredients often included in formulations targeting DHT or hair loss more broadly:
- Pumpkin seed oil
- Tea tree essential oil
- Lavender essential oil
- Zinc
The level of evidence behind these varies, and their effects—when present—tend to remain modest.
You’ll also come across ketoconazole, a non-natural ingredient frequently used in anti-hair-loss shampoos. While primarily known for its antifungal properties, it may also have a mild effect on scalp inflammation and local androgen activity.
What is more effective: a DHT inhibitor or a DHT blocker?
They don’t operate at the same level, so comparing them directly can be misleading. DHT inhibitors target the production of the hormone itself, which is why they are generally considered the most effective option when androgenetic alopecia is involved.
Products described as “DHT blockers,” on the other hand, tend to act more locally and with less consistent results.
That said, the right approach still depends on your situation—what’s driving your hair loss, how advanced it is, and how well you tolerate different treatments.
In some cases, combining approaches may make sense, especially when you’re trying to support overall scalp health alongside targeted treatment.
It’s also worth keeping in mind that results take time. Most treatments require several months of consistent use before any visible change, and responses can vary from one person to another.
Our final takeaway
DHT plays a central role in androgenetic alopecia, but it’s not the whole story. What matters most is how your hair follicles respond to it.
Understanding this mechanism helps you make more informed decisions—what to focus on, what to question, and what to realistically expect from different treatments.
There’s no one-size-fits-all solution, but a targeted approach—based on your situation and supported by consistent care—can make a meaningful difference over time.
