Is it okay to use serum twice a day? Most face serums are safe to be applied twice daily – once in the morning on a cleansed face, before the rest of your makeup, and once at night before bed.
Can I use serum only once a day? In short: morning or evening are both fine, but be sure that you cleanse your pores beforehand. You also only really need to use face serum once per day regardless.
How often should I use a face serum? Generally, you should use a serum all over your face and neck twice daily, once in the morning and then again in the evening, before applying your moisturizer if you want to get the most bang for your buck, according to Lamb.
What happens if you use too much serum? Serum. A pea-sized amount of serum gives your skin a concentrated boost of ingredients that help with hydration, exfoliation, acne, or dull skin. If you use too much: Using too much of any product leaves active ingredients sitting on your skin. Some, such as exfoliating serum, can lead to stinging or peeling.