Sebum is an oily substance produced by your body to keep your skin moisturized and protected. It's a necessary component of healthy skin, but having too much or too little can cause problems. Everyone's body is different, so there's no exact amount of sebum that's ideal.
Too much sebum can lead to oily skin, clogged pores, and acne. Too little sebum can lead to dry skin, flakiness, and irritation.
It's important to maintain a healthy balance of sebum on your face. If you have oily skin, you may want to use products that help to control sebum production. If you have dry skin, you may want to use products that help to moisturize your skin.