Markus Lüthy, founder and MD of Elfetin Cosmetics, explains why not just the active substance but also the concentration level of such a substance that plays a key role in the efficacy of cosmetics. Based on many years with the active substance suppliers Pentapharm (now DSM) Mr. Lüthy can confidently say that in Elfetin’s products, the company uses as high a concentration of the active substance as they can.
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