Define Age-Defying Treatment with Hydroxy Acids & Retinol PM

COSMEDIX Define is my preferred serum-treatment in the evening, on non-Tret nights. It does pack a small dose of retinol, alongside multiple forms of skin-loving, cell-sloughing, smoothing, and brightening hydroxy acids. This is the most active in the “stable and steady” lineup of skin hacks (besides the tretinoin, ofc) but it’s worth the very low risk. If you can tolerate gentle acids and want a lotion-serum hybrid you can use to accelerate skin renewal for brighter, smoother, glowing skin—this is it.