I only use this if I've worn makeup or SPF during the day, so I don't use it daily (but most days)

I use it immediately after washing my face, when my skin is still damp but not dripping.

I do the sandwich method with my tretinoin: I use this 30 minutes before tret to buffer and 30min after to minimise irritation as much as I can as I now started using tretinoin daily.