L'Oréal Youth Code Serum Intense

Bottom line

L'Oréal Youth Code Serum Intense is very similar to Lancôme Génefique Youth Activating Concentrate (*Est. $80 for 1 oz.). Both formulas tout the inclusion of a yeast compound that can all but turn back the hands of time. Visible results, however, are more likely due to the light-reflecting particles it contains than anything else. The serum contains a lot of alcohol, which can be bothersome, especially for those with sensitive skin. Olay Regenerist Daily Regenerating Serum, Fragrance Free (*Est. $20 for 1.7 oz.) is a better and more gentle option, based on a comparison of reviews by users and experts.

Performance

Lots of alcohol -- an irritant: The star ingredient in L'Oréal Youth Code Serum is a yeast compound that is supposed to stimulate genes in the skin that are responsible for regeneration. Paula Begoun, skin care expert and author of "Don't Go to the Cosmetics Counter Without Me," says the research is "intriguing," but there is nothing that shows the ingredient to be effective when applied topically. The formula also contains light-infusing particles. Some users at Amazon.com say the serum produces noticeable results. One says, "My skin texture is softer, there is a more even skin tone, and I definitely see a more youthful look." Others see no difference at all. Begoun warns that Youth Code contains more alcohol than beneficial ingredients -- which can cause irritation and free radical damage, and prevent healthy collagen from being formed.

Feel and smell

Tingles on contact: Reviewers say L'Oréal Youth Code Serum Intense has a silky, soft finish, but it tingles a bit when first applied -- likely due to the high alcohol content -- but the sensation fades quickly. Some users find the "perfume-y" scent to be bothersome.