When it comes to pure mineral makeup, the answer could be forever. An indefinite shelf life may seem like a stretch, but mineral makeup that is derived from inorganic ingredients (doesn’t contain water or life) and does not contain moisture or other fillers, the mineral powder doesn’t provide the opportunity for microbial or bacterial growth. This is what makes the idea mineral-based makeup just as safe and effective on day 465 as it was on day 1.However, we aren’t saying that you should keep your mineral makeup forever. There is a shelf life and for good reason. It’s important to understand that not all brands of mineral makeups are the same, and how you use and store your products can change the recommendation on how long to keep cosmetics in your beauty bag.