Black tea hair rinses are widely used to promote hair growth, as the tea’s high antioxidant and caffeine contents are believed to support a healthy scalp and hair
Advocates claim that the caffeine found in black tea can reach hair follicles to block dihydrotestosterone (DHT) — a hormone linked to hair loss in people with a condition known as androgenic alopecia
High levels of DHT have been shown to shrink hair follicles and shorten the hair growth cycle, leading to weakened, brittle hair that falls out more easily
A test-tube study in human skin samples suggested that the topical application of caffeine and testosterone may support hair growth by increasing keratin production and lengthening the anagen (hair-producing) phase of hair growth
Though widely known for its nutritional benefits, black tea is also used as a hair care treatment. Many proponents state that it helps increase hair growth, enhance hair color, and boost hair sheen.
In particular, people have used black tea rinses, which apply black tea directly to the hair, as a beauty remedy for centuries. That said, you may wonder whether any scientific studies support these claims.
This article explains whether black tea is effective for hair health and tells you how to do a black tea rinse.
Black tea contains a high concentration of tannins, a type of polyphenol antioxidant that neutralizes cell-damaging compounds called free radicals
In particular, black tea contains theaflavins and thearubigins, which give it its characteristic dark color
Due to this dark pigment, black tea rinses may give naturally dark hair a temporary boost of color and help reduce the appearance of grey hairs. Yet, this short-term solution won’t last after you wash your hair a few times.
Furthermore, this treatment doesn’t work well on those with blonde, red, white, light brown, or other lighter hair colors.