How To Use Lactic Acid?

Use it after your toner as a treatment step ! There is hyaluronic acid in this formulation which is great with dampened skin but most exfoliants should be used on dry skin to avoid risk of sensitisation. If you are using it on slightly dampened skin be aware of any signs of irritation in your skin . Let it soak in then apply your moisturiser :)

Using it on damp skin can help increase penetration which isn’t the best with acids at first, it could increase irritation but since this is gentle and if you have tolerance, you can use on slightly damp skin and definitely take greater advantage of the hyaluronic acid in the formulation! After letting it dry, apply your moisturiser.

use it after toner! then wait for it until it dries out on your skin then apply the moisturizer

I’d say cleanse, tone (unnecessary step), lactic acid serum to dry skin, moisturizer

Clean, lactic acid (I will do it with dry skin even more if you're new to acids), toner, serum and cream.