Prevents aging by stimulating the production of endogenous hyaluronic acid. It also increases both skin hydration and the number of supporting fibers, collagen and elastin. An improvement in the turgidity and elasticity of the tissues is thus obtained. The products for biostimulation are based on low molecular weight hyaluronic acid and amino acids (such as glycine, proline, leucine and lysine). Low molecular weight hyaluronic acid causes fibroblasts to produce type III collagen, that is, the one that in young skin is soft and plentiful; Amino acids are useful in activating the formation of new collagen and the production of elastin.