Question: what ingredients are bad for your hair in shampoos?
Answer: Sulfates. Sulfates [1] are surfactants (surface acting agents) that are used to clean the dirt and excess sebum on the scalp. ... 
Parabens. ... 
Polyethylene Glycols (PEG) ... 
Phthalates. ... 
Formaldehyde. ... 
Triclosan. ... 
Dimethicone. ... 
Retinyl palmitate.