Vitamin C

Here's a chart for your reference. I hope it helps! ☺️

It depends on the formula and strength really. From my experience mixing my Klairs Vit C, COSRX BHA and Olay Retinol in my night routine is a big No No for my skin Now I use my exfolliants and Klairs Vit C during the day and retinoids at night.

BHA and AHA. I have this bha/aha toner from jumiso and vit c from the ordinary. I used both on the same routine and it was hella itchy. Though nothing disastrous happened, it's still very irritating on the skin.

Retinol and vit c, but I think that’s avoidable because vit c is more effective in the morning and retinol is more effective at night 😊

I heard retinol... so I use vitamin C in the morning and retinol at night