The answer is going to depend on the reason for their shedding in the first place. Advice That May Help I sometimes get emails that ask for advice on "what to take to stop hair shedding." Specifically, people want to know if there's a shampoo, pill, herb, essential oil, or vitamin that can stop or diminish their hair shedding. Your body will adjust as your hair follicles reset to growing rather than resting - and this will happen in a few weeks or months. I'm sure you know this, but telogen effluvium is caused by some abrupt changes in the body (changing medications, illness, giving birth, having surgery, new scalp issues, etc.) In some instances (like pregnancy), you can take biotin and a multi vitamin to support your hair as it is regrowing, but this isn't going to stop the shedding by itself. Can You Take Or Use Something To Stop TE (Telogen Effluvium) Shedding?. What Can I Take to Make My Hair Stop Shedding So Much. I'll elaborate more in the following article.

That depends on what is the cause of the TE.