I can't use AHAs or BHAs because of cuperose on my cheeks (combination skin). So chose this sleeping pack - it contains PHAs, which have the same clearing and purifying properties but are much milder to the reddened and reactive skin :) I've been applying it every night before I go to sleep so it's too early to make any expert conclusions so far)) But it didn't break me out or worsen my skin condition so I suppose it's working anyway as all another products of Isntree I've tried out so far :) The smell is nice and herbal (like geranium or rosemary/lavender etc.)