SRD5A2
SRD5A2 5-alpha reductase 2 — the molecular target that 1 compounds in the wiki act on.
In one line: The enzyme that turns testosterone into a stronger form (DHT) — blocked to save hair.
SRD5A2 converts testosterone into DHT, a more potent version that drives male-pattern hair loss and prostate growth. Hair-loss drugs (finasteride, dutasteride) block this enzyme to protect the scalp.
The trade-off worth knowing: for a minority of men, lowering DHT dents libido or mood, and occasionally these effects persist. Very effective for hair — weigh that risk honestly.