Optimal Excellent retinol serum. Follow the directions. The only flaw is the dropper. It's a bit difficult to get a hold of because it's thick, and the nozzle at the end, in my opinion, doesn't helpRead more
OptimalNon-oily, soothing and super hydrating serum. The skin is visibly healthier and brighter, it is delicate and does not clog pores, it dries immediately.
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