what are cosmetics made from?

The main ingredients :

 The main ingredients in mineral makeups are usually coverage pigments, such as zinc oxide and titanium dioxide, they are both sun creams.Other main ingredients include mica (Sericite) and other pigmenting minerals, such as iron oxide, tin oxide and magnesium myristate.
Mineral makeup usually does not contain synthetic fragrances, preservatives, parabens, mineral oil, and chemical dyes. Because of this, many dermatologists consider mineral makeup to be purer and kinder to the skin than makeup that contains those ingredients.

Benefits

Because titanium dioxide and zinc oxide have an anti-inflammatory propertie, mineral makeups with those ingredients in them can also have a calming effect on the skin, which is particularly important for those who suffer from inflammatory problems such as rosacea. Zinc oxide is also anti-microbial, so mineral makeups can be beneficial for those with acne.
Mineral makeup is noncomedogenic (as long as it doesn't contain talc), and it offers a mild amount of sun protection (because of the titanium dioxide and zinc oxide).
Because they don't contain liquid ingredients, mineral makeups can last in their containers indefinitely as long as the user doesn't contaminate them with liquid.