The natural moisturizing factor in human skin. Na-PCA with Aloe Vera is a Ph-balanced, concentrated solution of the sodium salt of pyrrolidone carboxylic acid (the natural moisturizing facto found in human skin), combined with the highest quality aloe vera gel. NA-PCA is synthesized from glutamic acid, a nonessential amino acid. The skin contains natural moisturizers, the most important being Na-PCA. Old skin contains only about half the amount of Na-PCA as that found in young skin. The ability of skin to hold moisture is directly related to its Na-PCA content. It is water, and not oil, that keeps skin soft and supple. Na-PCA pulls water out of the air, moisturizing the skin, improving its appearance, and giving it a moist and youthful glow. This is not a cosmetic cover up; it is a physiological correction of an age-related deficiency state. Na-PCA with Aloe Vera provides quick relief from dry and cracked skin, burns, shaving irritations, detergent rash and other minor skin irritations. The aloe vera gel in this fine product is produced form the crystal clear gel or Aloe barbadensis Miller (Aloe vera lime) by a unique extraction and purification process exclusively developed by TwinLab. The aloe vera gel has never been powdered, frozen or reconstituted. Therefore, it retains its maximum biological activity and effectiveness. Non-oily. Hypo-allergenic. Unscented.