Have you seen no chemical craze in cosmetics these days? Yes, the trend of natural has caught up fast.
The most common chemicals in regular shampoos are SLS and parabens. They both are the ones that are absent in natural shampoos.
If you are not aware of those 2 strange chemical terms. Then, in simple terms, these ingredients make the shampoos function.
SLS is the technical term for the lathering ingredient in shampoos. The full form for the same is Sodium Laureth Sulfate.
While the parabens work as the preservation ingredients.