Substances you should avoid in your shampoos that damage your hair.

There are several ingredients that should ideally be avoided in a shampoo due to their potential to cause harm to your hair. Some common culprits include sulfates, which can strip your hair of its natural oils; alcohol, particularly ethanol, which can dry out your hair; and formaldehyde, a known carcinogen that has no business being near your scalp. Additionally, look out for parabens and silicones, which may weigh your hair down and hinder its ability to breathe.