Essences. Masks. Copper. Retinol. Vitamin C. Today there are more categories of skin care products and important ingredients in these products than anyone can learn and master. If you’re like the vast majority of women and men in the United States, the sheer number of different kinds and brands of skin care products on the shelves leaves you confused. Which of the hundreds of different products sitting on shelves in front of you do you actually buy? Well, rest assured.  You’re not alone...