The Inkey List say this can be used every day and fine for sensitive skin . but I think if you have very sensitive skin it's definitely better every other day. I did build up gradually. Once a week, twice a week, three times a week. But as soon as I tried on 2 consecutive nights my skin freaked out. Definitely continue as AHAs are a big no no for me. But if you have sensitive, reactive, rosacea prone skin I'd say processed with extreme caution. Originally posted on www.theinkeylist.com