If you know that mac lipstick has expired, you can't use it. Lipstick is a product containing lead. After expiration, the composition may change to some extent. If it is used on the lips, it may be eaten, so it is not good for human health. It's overdue. I suggest throwing it away immediately. We can find that the shelf life of lipstick is still very long, usually three years, but if the lipstick is opened, the shelf life may be about one year. I suggest you use the lipstick that has been opened as soon as possible, otherwise it will easily expire. If we eat expired lipstick, it will not only be harmful to human health, but also affect the skin damage of our lips. The mucous membrane of the lips is serious, which may cause allergies, redness and ulceration, and can no longer be used. Lipstick in our village, when a lot of things are eaten together, you will accidentally eat the spoiled lipstick in your stomach. Not only can the safety of ingredients not be guaranteed, but also many toxic and even carcinogenic substances may be produced. Poisoning symptoms such as diarrhea will appear after eating. I suggest you be vigilant. Now that the introduction is over, can the expired mac lipstick still be used? We have a better understanding of this problem. I suggest you pay special attention when using lipstick. It is very necessary to use it within the warranty period.