It's not a bonus layer, it is the last layer you added is what is doing the work. That said I use++
Paula's Choice Barely There Matte Skin Tint
Lip scrub, keeping lips well hydrated (heavy duty balm at night, I use Paula's Choice ++
Paula's Choice Mineral Moisturizer spf 30
love Paula's choice resist 2% BHA. Don't need it now but loved it when i had clogged pores.
If tretinoin isn't an option then maybe retinol or retinaldehyde can be used +++
Essential oils and plant stuff, in general, tends to be 'a mixed bag', they may have their +
Might not be just one. I do like ascorbic acid - Paula's Choice C15, Vichy Liftactiv +
Paula's Choice Birthday gift
Paula's Choice.