Cosmetics When Exposed To Sunlight

I have noticed that cosmetics and toiletries are like foods that are rich in oil ingredients. I wonder it will also contain microbes when exposed to bright daylight and oxygen from the air like foods ?
Come to think of it, cosmetics and toiletries like food, are also under attact from microbes when exposed to bright daylight and oxygen from the air. This is probably why UV absorbers are added to protect from the effect of light and antioxidant to protect the product from the detrimental effect of oxygen. Because some antioxidants are also used as food additives to preserve the fats and oils present in pre-cooked foods.