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The ingredients most beneficial for your skin are not stable, which means they won’t be effective if exposed to light and air, which is exactly what happens when you take the lid off a jar. There is also the issue of hygiene; dipping your fingers into a jar transfers bacteria from your hands into the product, and that causes the important ingredients to further deteriorate.
If you are a person that likes to research your skin care products carefully and understand the different ingredients, you will see the terms AHA and BHA thrown around fairly regularly. Properly formulated AHAs and BHAs are excellent choices for exfoliating the top surface of the skin and both hydroxy acids work to reduce wrinkles, stimulate collagen, promote skin firming.