Davines Natural Tech Hairbuilding Pak uses a bevy (eight in total) of amino acids to repair dry, brittle and aging hair. Although my hair was already in fairly good condition, the texture is smoother and glossier after using Davines for a week or so. It is too soon to tell if Davines is making my hair stronger and the research on whether all these amino acids promote hair growth (or hair health) is patchy.

There does seem to a demonstrable link between lysine and hair loss. A study on women with thinning hair found that they were deficient in zinc and lysine helps the body absorb zinc and iron. Far be it from me to split hairs, but this is the only amino acid about which I could find anything convincing in relation to hair loss, growth or health. Although I did discover that human hair has 18 amino acids.

Creatine is one of the other amino acids used. Many who use this ingredient (orally or topically) report an increase in hair growth and thickness, although others claim it to cause the reverse effect as well (i.e. hair loss). Either way, there isn't much solid data on creatine. Arginine is the building block of proteins, it plays a pivotal role in cell division, the healing of wounds, immune function, the release of hormones, and the production of growth hormone. There is no research on hair and not much on the topical application of arginine on the skin. In fact, the most substantial evidence regarding the effects of topical amino acids on the skin comes from a 1989 study, which assessed that they may assist with hydration. Yet another amino acid is alanine. It's primary function in cosmetics is as a water binding agent.

There are a few things I don't like in Davines. Cetrimonium chloride is mainly used to prevent static build up in hair. Research has shown that it can be an irritant. Performing the same function, but even less friendly is behentrimonium chloride, a toxic compound, and concentrations of .1% and higher have been shown to damage the eyes by causing tissue death of the mucous membranes.

Ingredients

Water, cetearyl alcohol, glycerin, palmeth-2 phosphate, glycine, cetrimonium chloride, cetyl alcohol, ceresin, silicone, quaternium-8, jojoba seed oil, behenyl alcohol, creatine, arginine, hydrolized wheat protein serine, glutamic acid, propolis wax, threonine, alanine, lysine, proline, betaine, sodium PCA, tocopherol, behentrimonium chloride, propylene glycol, dimethicone, sorbitol, disodium EDTA, hydrogenated palm glycerides citrate, phenoxyethanol, methylparaben, ethylparaben, propylparaben, potassium sorbate, citric acid, fragrance.