Simply put yes, it absolutely does. Similar to certain food products makeup has a sell by date rather than a strict expiration date. No, there are no rules or regulations that require beauty brands to place a physical deadline on their products. The reason why is simply the start date is determined whenever you first open it and place it on your face.
While they could place a small disclaimer saying the recommended expiration time frame, like some natural juice companies that say best if used in 7 days after opening, they don’t. There are other factors to consider which may be why: If you put on your mascara to make yourself feel more alive than you do on the inside, you probably shouldn’t put it back on your face again. The basic use by standards are placed below that scientists recommend due to the rate of bacteria growth on the products. In other words, your makeup could be making you sick.