If you delve into hair loss, you'll quickly encounter DHT. It's on shampoo labels, in articles about finasteride, and on forums full of men trying to stop their hair loss. But what exactly is DHT? And why does one man lose his hair because of it while another is barely affected?
What is DHT?
DHT stands for dihydrotestosterone. It is a hormone produced in your body from testosterone. The enzyme that does this is called 5-alpha-reductase, and it is found in the skin cells of your scalp, among other places.
DHT is not a byproduct that your body accidentally creates. It plays a role in male development during puberty, in beard growth, and in prostate function. It is a normal part of male physiology.
The problem is not that DHT exists. The problem is what it does to men with a certain genetic predisposition.
How DHT causes hair loss
DHT binds to androgen receptors in the hair follicles. In men without a genetic predisposition to baldness, the follicle hardly reacts. But in men with sensitive follicles, a process begins.
This process is called miniaturization. The growth phase of the hair, the anagen phase, becomes progressively shorter. Hairs that normally grow for three to five years before falling out now only grow for one to two years. Then shorter and shorter. The hairs become thinner, lighter in color, and shorter. Eventually, the follicle stops producing altogether.
This happens slowly. Over months and years, not overnight. That's also why many men only notice it when it has been going on for a while. The change is so gradual that it's hard to see until a photo from two years ago suddenly surfaces.
The hair growth cycle and what DHT does to it
To understand why miniaturization is such an insidious process, it helps to briefly know the hair growth cycle. Each hair goes through three phases:
- Anagen — the growth phase. The follicle is active and the hair grows. This normally lasts two to six years. The longer this phase, the longer your hair can grow.
- Catagen — a short transitional phase of two to three weeks. The follicle retracts and the hair stops growing.
- Telogen — the resting phase. The hair is still in the follicle but is dead. After two to four months, it falls out and the cycle begins again.
DHT shortens the anagen phase. Not from three years to two years at once, but gradually. After each cycle, the growth phase is slightly shorter than the previous one. The hair that grows back is slightly thinner than before. Over dozens of cycles, this accumulates into visible hair loss.
Sensitivity, not the amount of DHT
This is the point that surprises many men: it's not about how much DHT you have. A man with high testosterone levels and relatively high DHT can have a full head of hair. A man with average levels can already be significantly balder by the age of 25.
The difference lies in the sensitivity of the androgen receptors in the follicles. This sensitivity is genetically determined. If your father or maternal grandfather went bald, there is a greater chance that your follicles are more sensitive to DHT. But the genetics of hair loss are complex and do not follow a simple inheritance pattern. You can have a bald father and still maintain a full head of hair, or vice versa.
Something else also plays a role: the distribution of 5-alpha-reductase activity over the scalp is not uniform. On the hairline and crown, this activity is higher than on the sides and back. That is precisely why male pattern baldness begins on the hairline and crown, while the sides and nape are spared. The recognizable Norwood pattern is actually a map of DHT sensitivity on the scalp.
What you can do about DHT
There are two ways to intervene in the DHT mechanism.
The first approach is to lower DHT production. Finasteride does this by inhibiting the 5-alpha-reductase enzyme. This lowers DHT levels in the scalp by 60 to 70 percent. The drug is effective in most men who use it, but has potential side effects and requires a doctor's prescription. We previously wrote an honest overview of how finasteride works and what you need to know about it.
The second approach does not focus on lowering DHT, but on supporting the follicles so that they are more resistant to the effects of miniaturization. Certain ingredients act on the vitality of the follicle and the length of the anagen phase, without interfering with your hormone system.
The Hairborn Growth Serum works in this way. The formula contains, among other things, Redensyl, an ingredient that activates stem cells in the hair follicle and helps extend the anagen phase, and caffeine, which stimulates blood circulation to the scalp. It does not interfere with your DHT production, but directly supports the follicle. For men in an early stage of hair loss, this can be a meaningful approach, as an alternative or in addition to other treatments.
How early intervention matters
DHT causes damage over time. Follicles that have been slowly miniaturized can, in principle, become active again if conditions improve. But follicles that have completely stopped and whose tissue has been replaced by scar-like tissue will no longer respond to anything.
That makes timing important. The sooner you start an approach, the more there is to protect. This is not meant as pressure, but as a factual explanation: those who wait until their baldness is clearly visible have fewer options than those who intervene at an early stage.
If you notice your hairline receding or your crown thinning, that's the time to seriously consider what you want to do. Not in panic, but also not by ignoring it.
When DHT is not the cause
Not all hair loss is related to DHT. Sudden, diffuse hair loss over the entire head, where you suddenly lose significantly more hair than normal, is almost never androgenetic. In such cases, it is more likely to be telogen effluvium, caused by stress, illness, iron deficiency, or other factors.
Male pattern baldness (androgenetic alopecia) has a recognizable pattern: receding hairline, thinning crown, with the sides and back spared. If this pattern is present, DHT sensitivity is almost certainly a factor.
When in doubt, it is advisable to consult a general practitioner or dermatologist, especially if the hair loss is rapid or progresses unusually. A blood test can rule out other causes.
Summary
DHT causes male pattern baldness by binding to sensitive hair follicles and initiating a slow miniaturization process. The sensitivity of these follicles is genetically determined and varies from person to person, regardless of how much DHT you produce. The approach depends on how far the process has progressed and what level of intervention you desire. The sooner you start, the more there is to protect.