Short answer: It can add to it. The Depo-Testosterone and testosterone enanthate labels list male pattern baldness among androgen side effects, and the AndroGel 1.62% label lists hair loss among reports after approval, but none gives a rate. Pattern baldness is driven by genes and by DHT, a hormone the body makes from testosterone. The AndroGel label reports that DHT levels rose in step with testosterone on treatment.
| Product | What the label says | Rate |
|---|---|---|
| Depo-Testosterone (cypionate) | "Male pattern of baldness" listed with hirsutism, oily skin and acne | No rate |
| Testosterone enanthate (vial) | "Male pattern baldness" listed with hirsutism and acne | No rate |
| AndroGel 1.62% (gel) | Alopecia (hair loss) listed among reports after approval | No rate; reports from a population of unknown size |
| Xyosted, Aveed, Kyzatrex | Not listed in their trial tables | n/a |
A side effect that is missing from a trial table was not reported often enough in that study to be listed; it does not mean it cannot happen. The older labels list male pattern baldness in a group of skin effects seen "with some androgens", without saying how often.
MedlinePlus says male pattern baldness is related to your genes and male sex hormones. Its genetics page explains that this kind of hair loss, especially in men, is related to androgens, in particular dihydrotestosterone (DHT). Too much stimulation of hair follicles by androgens can shorten the growth phase, giving shorter, thinner hairs, and delay regrowth of hairs that are shed. The only gene confirmed so far is the androgen receptor gene, which may make follicles more easily stimulated.
DHT is made from testosterone. The Depo-Testosterone and enanthate labels say that in many tissues testosterone acts after being converted to DHT. The AndroGel 1.62% label reports that average DHT levels on treatment rose and fell in parallel with testosterone.
So the link is plausible: more testosterone means more DHT, and in people whose follicles are sensitive, more DHT can speed up pattern hair loss. The labels do not say how much risk this adds, whether it depends on dose, or whether it reverses.
The testosterone labels list male-pattern baldness among effects reported in women who misused androgens. For women given doses meant to match normal premenopausal levels, the 2019 global consensus statement on testosterone for women found mild increases in acne and body or facial hair in some, but not hair loss. See can women take testosterone.
Testosterone gel can pass to others by skin contact. The AndroGel 1.62% label lists changes in body hair in an adult woman as a possible sign of exposure to bring to a doctor's attention.
MedlinePlus lists minoxidil, applied to the scalp, and finasteride, a pill that blocks the making of the highly active form of testosterone linked to baldness, as treatments for male pattern baldness, and dutasteride as similar to finasteride. Whether either suits someone on TRT is a question for the prescriber; the hair loss page covers what their labels say.
MedlinePlus also notes that hair loss in patches, heavy shedding, broken hair, or loss with redness, scaling or pain can point to other causes. Useful notes for a visit: when thinning started relative to your first dose or dose changes, your product and dose, recent lab results, and photos taken in the same light every few months. Dose Track keeps doses, lab results and notes on one timeline.
Read more on Dose Track: Pattern hair loss: finasteride, minoxidil and more · Minoxidil vs finasteride · Finasteride vs dutasteride · Depo-Testosterone side effects · AndroGel side effects · TRT symptom tracker: what to log