Sweat is composed of water, electrolytes, and other compounds that are excreted by the body through the skin. While sweat itself does not directly contribute to hair growth, it can create a moist environment on the scalp that may be beneficial for hair health. A moist scalp can help to prevent dryness and itching, which can lead to hair breakage and hair loss. Additionally, sweat can help to remove dirt and product buildup from the scalp, which can clog hair follicles and inhibit hair growth.
There is some evidence to suggest that sweat may also contain growth factors that can promote hair growth. One study found that sweat from mice that had been exposed to high levels of testosterone contained higher levels of insulin-like growth factor-1 (IGF-1), which is a hormone that has been shown to promote hair growth. However, more research is needed to confirm these findings and to determine whether sweat from humans has similar effects.
