Gentle Vitamin C recommendations?

Hello friends! Does anyone have a favorite vitamin C that is gentle and brightening? I’ve used azaelic acid in the past and felt it caused some mild irritation so interested in trying vitamin C instead. I know it can sometimes cause acne so would love to hear anyone’s recommendations for a more mild and gentle option. I have dry and sensitive skin and use differin. (Also love Asian beauty and lean toward their products) 🙂