The main active ingredient in self tanners that’s responsible for colour development is Dihydroxyacetone (also known as DHA). Products will typically use either a synthetic or natural form of DHA.

But that natural glow is only if you get the right self-tanner . . . the wrong one can make you look like an orange and smell ...

It has moisturizing raspberry seed oil, hydrating aloe vera and an eco-cert organic DHA tanning active which provides a natural-looking color. Isle of Paradise Self Tanning Natural Glow Face Drops ...

The part of the sun is played by dihydroxyacetone (DHA), which reacts with amino acids ... Test a small area first. "A self-tan that may be great on one person makes someone else look orange ...