how long should you keep used lipstick
Here are my general guidelines for the average shelf life of most cosmetics: 1  Powder based products (e.g. mineral foundation, eye shadows, blushes): 2-3 years. 2  Liquid foundation: up to 1 year. 3  Lipstick/gloss/liner: 2 years max for lipstick.  Mascara/liquid eyeliner: 2-3 1  months. Pencil eye liner: 2-3 years.