+29 Is Sweating Bad For Your Hair References. (cue soothing music and water sounds…) Web the lactic acid in sweat is good for hair, but excessive sweating (and so excessive lactic acid) can severely damage your hair follicles.

If you let sweat dry in your hair after your workout, it can damage your hair. It happens when excess sweating is not triggered by a rise in temperature or physical activity. When you let sweat sit on your hair for too long, it can clog your follicles.