Finasteride is the active ingredient of a medication that is used in the prevention of prostate enlargement. Patients who took medications, which contains this active ingredient, started experiencing having more hair on their body and on their scalp. As this was discovered, the other ingredients were reduced from the formula, and it has been prepared for use on hair. One needs to take it under a physician’s supervision. Finasteride helps in ensuring the thickening of the thinning hair, making it stronger, and richer, and ensures its growth, and therefore, delays hair loss.