Vitamin made in the skin from sunlight, also taken as a supplement
Technique that makes tiny punctures in the scalp with fine needles
Injections of drug or vitamin mixtures into the scalp
B vitamin, often sold as a hair supplement
Oil from the neem tree, used in traditional remedies
- Can melatonin cause side effects on the skin or hair? No study links melatonin to hair loss; reports are anecdotal. Some users report scalp dryness or irritation from topical products, and a safety review lists mainly mild side effects such as sleepiness and headache.