Cos de Baha - kamiey review for Retinol 2.5% Serum + Vitamin E

2.5% considered high percentage for beginner, but this is my first retinol, the purging I experience is not bad as I really moisturizer my skin . My skin glow after 3-4 week of usage, I use it once per week, then twice per week, 3x per week, and daily use.