
Here is the scoop: There is already a small amount of bacteria present in makeup BEFORE you even open it and try it on. So by the time that you expose it to air and start putting your dirty hands and brushes all over it, the bacteria will have increased significantly. It’s not a health hazard of any kind, your skin can withstand a little bacteria. But if you already have unhealthy skin, you’re only asking for trouble.
Below is some professional advice on shelf life for your makeup so you can stop feeling sentimental about that one product you just love so much but have got to let go.
Foundation: You should only keep it around from 6 months to a year.
AND, PLEASE PEOPLE, for the love of everything that is beautiful, do not share your make up. It is unsanitary and you do not know where these peoples’ lips, eyes, or faces have been. This is one of those instances where you JUST SAY NO.
For all you lovers of MAC cosmetics, BACK TO MAC is a great incentive to throwing out your old MAC products. Learn more here