Na-PCA is a natural component of your skin that helps it stay moisturized by drawing and retaining water. Young skin has lots of Na-PCA, old skin doesn’t. TwinLab’s NaPCA is a convienent and inexpensive spray that is easy to apply especially to your back and hard to reach areas. We always kept a sample bottle in the store and sampled it to men and women. We would lightly spray one arm, wait a few minutes then have them feel first one arm, then the other. The arm without the spray felt like sandpaper in comparison to the arm sprayed with Na-PCA. You can tell the value of a product not by the first bottle you sell to someone but by the third. If it works, they keep using it. This product truly is a great skin lotion because it works.