Caffeine stimulates the growth of hair follicles

But a German cosmetics company has developed a caffeine-rich solution that can be applied to the scalp.

"although caffeine is a well-known substance, we know very little about its effect on human hair follicle growth, and this study shows that it is effective in stimulating hair follicle growth," the researchers said. "

Most people lose their hair because the hair follicles that grow their hair are exposed to the male hormone dihydrotestosterone. When the blood contains a large amount of dihydrotestosterone, the hair follicles contract, resulting in thinner hair and shorter lifespan.