What Is DHT? Signs, Effects on Hair Loss, & How to Reduce It
If you have started reading up on hair loss, the term DHT will not have taken long to appear. It shows up across forums, treatment pages, and product labels, often with little explanation. Before considering any course of action, it helps to understand what DHT does, how to spot when it may be affecting your hair, and what can responsibly be done about it.
What Is DHT?
DHT stands for dihydrotestosterone, a hormone derived from testosterone through the action of an enzyme called 5-alpha reductase. It is present in both men and women and plays a normal role in the body during development. In itself, DHT is not the problem. What matters is how genetically susceptible hair follicles respond to it. Certain follicles are more sensitive to DHT than others, and this is where its connection to hair loss begins.
How DHT Contributes to Hair Loss
So how does DHT translate into visible hair loss?
In susceptible follicles, DHT gradually shortens the anagen (growth) phase of the hair cycle. With each successive cycle, the affected follicles produce shorter, finer hairs, a process known as miniaturisation. Over time, the hair shaft becomes too thin to provide visible coverage.
What determines whether a follicle is affected is largely genetic. Follicles at the crown and along the hairline tend to carry more receptors that respond to DHT, which is why thinning in these areas often shows up first. Follicles at the back and sides of the scalp, on the other hand, are genetically less sensitive to DHT, which is why hair in these zones tends to remain intact even as pattern loss progresses elsewhere. This is also why the back of the scalp is generally used as the donor area in an FUE hair transplant. The underlying condition driving this pattern is androgenetic alopecia, the most common form of pattern hair loss in both men and women.
What Are the Signs of High DHT?
So, what are the signs of high DHT activity in the first place? On the scalp, the most common indicators include a receding hairline, thinning at the crown, a widening part, finer hair shafts, and increased daily shedding. While losing around 50 to 100 hairs a day is considered normal, consistently shedding noticeably more than that, particularly when accompanied by visible thinning, may suggest that something has shifted.
Other signs can appear elsewhere, since DHT influences more than just scalp follicles. These may include an oily scalp or skin, adult acne, and increased facial or body hair growth.
That said, these signs can overlap with other conditions such as thyroid dysfunction, PCOS, and nutritional deficiencies. A proper clinical assessment is the only way to know for certain.
How to Reduce DHT: Medical Options and Lifestyle Factors
If DHT is confirmed to be a factor, what can be done about it? Approaches to reducing DHT generally fall into two areas: medical treatment and supportive lifestyle measures.
DHT Blockers
A DHT blocker is a medication or compound that inhibits the 5-alpha reductase enzyme, reducing the conversion of testosterone into DHT. Finasteride is one such oral DHT blocker, FDA-approved for androgenetic alopecia and prescribed only after clinical assessment.
Topical formulations are also available, and in some cases, clinicians may consider combination approaches with minoxidil, depending on the individual.
Side Effects of DHT Blockers
Side effects of DHT blockers are worth discussing openly rather than minimising. Reported effects of medications like finasteride include changes in sexual function and mood, alongside less common reports of breast tenderness, mild skin reactions, and occasional dizziness. This is why an honest conversation with a doctor is part of any responsible prescription.
While not everyone experiences these effects, if they do occur, they are typically reversible once treatment stops. Still, this matters when making an informed decision.
Lifestyle and Dietary Considerations
Beyond medication, supportive factors play a quieter role. Chronic stress can disrupt the hair cycle, sleep quality affects hormone regulation, and balanced nutrition supports follicle health. None of these will neutralise DHT on their own, but they contribute to overall scalp wellbeing.
A Diagnostic Approach Before Reaching for Treatment
High DHT activity is only one of several possible causes of hair thinning, and the signs alone are not enough to confirm it. A proper assessment, which may include a medical and family history review, a scalp examination, and, where appropriate, blood tests, can help establish whether DHT is the underlying factor for you.
If you want clarity on the cause, consider consulting Sage Medical, a hair specialist clinic in Singapore, for a personalised hair loss assessment.
