Credit: Jean Baptiste Lacroix/

Looking for an excuse to splurge on the bio-engineered skin serum that counts stars Christina Hendricks and Julia Roberts as fans?

To introduce the first-ever Genes Day on Friday, October 22, Lancôme will donate a portion of sales of its Génifique Youth Activating Concentrate to St. Jude Children's Research Hospital.

The serum, which is the product of ten years of scientific research, helps bring visibly younger skin in just 7 days. The elixir can be applied day or night, and absorbs into the skin instantly without any stickiness or residue left behind.

The makeup line will donate $7 of each bottle of Génifique sold on Friday to the research hospital, which promises treatment for every child (even if the family is unable to foot the bill).

Génifique ($78) is available at Lancôme counters and at