Topical immunotherapy involves applying a chemical to areas of hair loss.6 Application is to the scalp, brow, or beard, and has been shown to promote hair growth in both men and women.
Minoxidil and finasteride are two of the most common chemicals, and are for adult use only. Minoxidil has minimal side effects, but is not considered effective for extensive hair loss. Finasteride is only suitable for men, not for female alopecia sufferers.