I was going to write an excellent short piece on L'Oreal's Youth Code Serum. I have used it for about 3-4 months off and on and noticed very positive results. Among them are better skin elasticity, skin feels firmer and a tad bit brighter (not lighter).
However, while researching I found a much better piece than I would have written and I posted the information below or you can access it using this link.
The secret to L’Oréal Youth Code appears to be in the product line’s inclusion of Pro-GenTMtechnology, AKA bifida ferment lysate, AKA probiotic bacteria. Although it has been suggested by many in the past that probiotics do not have any effect on the skin, recently published research inExperimental Dermatology suggests that bifidobacterium may stimulate the skin’s ability to repair itself. It is suspected that bifidobacterium may decrease skin sensitivity by reducing neuronal reactivity and accessibility, as suggested by the cells’ decreased release of the peptide CGRP upon exposure to capsaicin in in vitro studies.
With all this having been said, I think L’Oréal Youth Code is a better skin care regimen for young women who are looking to prevent signs of aging, rather than those who are already experiencing fine lines, wrinkles, serious hyperpigmentation (i.e., solar lentingos), or the like. The reason I say this is two-fold: First and foremost, the most active and revolutionary ingredients, bifida ferment lysate and vitamins C and E, have effects that are altogether more preventative than restorative. In fact, only 69-71% of women who used Youth Code reported a decrease in the appearance of fine lines and wrinkles, which is not altogether all that promising, considering the high concentration of line-filling silicones in the product as well as the consideration that about 2/3 of subjects in studies generally report improvements due to a placebo effect anyway. Second, women who are looking to treat existing signs of aging would be better off investing in proven ingredients like retinoids, AHAs (although never together with retinoids, as they inactivate one another due to differing optimal pH levels), and, of course, targeted in-house treatments from the dermatologist.
L’Oréal Youth Code is a solid product, but best for patients looking to stave off the signs of aging, rather than those with already formed fine lines, wrinkles, hyperpigmentation, etc.
If you are interested in L’Oreal Youth Code, I would recommend applying it under a broad-spectrum, UVA/UVB protective sunscreen of at least SPF 30+ daily, as the vitamin C and E in the product will enhance the effects of the sunscreen somewhat.