Question: what ingredients are harmful in shampoo?
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.