While skin comprises only 15% of body weight,it is the body's most important organ as it covers and protects the body and holds everything together.Skin slows internal water loss and acts as a barrier against harmful elements such as bacteria,pollutants and the sun's radiation.For this vital barrier to function at its best,the outer layers (epidermis and stratum corneum) must contain adequate moisture.This moisture is easily lost and must be frequently replenished.The skin has difficulty retaining moisture when the relative humidity at its surface falls below 70%.
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