Dimethicone
This is an ingredients used to seal the surface of skin and hair to keep the moisture. It texuarize hair and makes hair feel smooth. However, with its effect, it can clog pores on your skin including scalp and cause irritation like acne.
Parabens
Parabens can cause problems on hormone balance. It can be a cause of hair loss. Also it is known that parabens may cause breast cancer.
Want to see the whole list of chemicals to avoid in shampoos and conditioners?
The 5 chemicals are the ones widely known that we should avoid. However, there are so many chemicals we should be aware of. Here is a long list of them.
via weheartit.com
Alcohol when listed as one of the first four ingredients
Ammonium lauryl sulfate
Diethanolamine (DEA)
Dimethicone
Formaldehyde
Lanolin
Mineral oil
Parabens (methylparaben, propylparaben, for example)
Petroleum
Polyethelyne glycol (also called PEG/polyethelyne, or polyoxyethelyne)
Propylene glycol
Sodium chloride
Sodium laureth sulfate
Sodium lauryl sulfate (SLS)
Synthetic colors (often listed as FD&C or D&C followed by a color and a number)
Synthetic fragrance or parfum
Triethanolamine (TEA)
To avoid all these, you can look for organic hair care items or you can make your own shampoos and conditioners at home!