In the States, Good Genes contains lactic acid, an alpha hydroxy acid (AHA) that helps exfoliate the dead cells sitting on the surface of your skin. Unfortunately, the UK and the EU don't allow lactic acid treatments to be sold with such a high concentration of the ingredient as the original Good Genes has, so the brand worked hard to make a comparable substitute.
The result is Sunday Riley Good Genes Glycolic Acid Treatment (£85), which gives you the same head-turning glow, just with glycolic acid (another AHA) instead of lactic. While glycolic doesn't break down dead skin cells on the surface, what it does do is penetrate the skin to clean out all the gunk in your pores, making your skin look clearer and more radiant — a definite win-win.