Product cancel out each other

Yes it’s a thing BPO cancels out antioxidants AHA cancels out peptides It’s why keeping the routines to a minimum is key…combination products help here rather than separate serums for each step

there are certain ingredients in products that should not be used in the same routine because they cancel out. i don't currently have the guide for it but you can search for it in the internet

I think it is not necessarily in 10 steps of skincare, but it is more about combining/mixing two different ingredients in a routine, and it is based on the ingredients' characteristics so it is best not to put them together as they will cancel each other so you will get nothing from them, if not suffering from some kind of irritation instead 😥

maybe not canceling,but they cant be used together

Benzoyl peroxide will cancel out retinol and vitamin c.