Ideally, skin care products should be given three whole skin cell renewal cycles, that is, three months. This will give you enough time to see if the product or regime is benefitting your skin type.
Skin care products that contain both water and oil based ingredients (as many of them do) are great examples of emulsions that contain emulsifiers to help make them easier to apply and more appealing to the eye.
We like to think of a face serum as a supercharger for your skin. They’re packed with skin boosting ingredients such as antioxidants, peptides, anti ageing ingredients, vitamins, exfoliants and extra hydrating ingredients. Common skin serum ingredients include hyaluronic acid to hydrate, salicylic acid to exfoliate and antioxidants to support youthful looking skin.
When skin care products are opened (as in, the foil seal is removed), they immediately become exposed to the air. So when do we need to throw them away?