The phrase "epidermal layer" refers to the outermost layer of the skin, which acts as a protective barrier for the body. It is the part of the skin that we can see and touch. Full definition
Dual action also enables collagen boosters, antioxidants, vitamins, minerals, marine and phyto ingredients to penetrate deep into epidermal layers during the treatment. (africanbotanics.com)
Ullrich Steiner, at the University of Cambridge, and colleagues separated the layers that make up buttercup petals — an inner layer of starch and an outer epidermal layer that holds the yellow pigment — and shone light onto each. (newscientist.com)
UV rays from tanning beds penetrate the skins epidermal layer and may induce DNA alternations that promote the formation of cancer. (sciencedaily.com)