Sharing, especially sharing makeup with other people, can be harmful.  You should never share lip gloss because it spreads germs, infections and can make you sick.  If you share makeup supplies, throw them in the trash. If you do share make-up and still want to use it, be sure to clean and soak your makeup brushes in mild cleanser, alcohol and hot water just to kill the germs and bacteria.  If your friend doesn’t have the proper cleaning materials then, buy it for her as a gift.