Are there ingredients or products I should avoid using with All-In serum?

No, the ingredients in All-In serum can be combined/layered with any other skincare ingredients.

All-In serum contains Vitamin C and you may have heard that Vitamin C shouldn't be combined with peptides or niacinamide but this is a myth. The theory is that acids can break the bonds that hold peptides together making them ineffective but the conditions needed to break the bonds (high heat and strong acid) just don't exist on our skin or in our skincare products. Niacinamide is a stable antioxidant that has been shown to work synergistically with Vitamin C so they can be safely used together. 

There is still an ongoing debate over whether copper peptides (the blue ones with free copper) can be safely used with vitamin c but we believe they can be used together as long as the vitamin c isn't at a pH below 2.5 Our vitamin C serum is formulated at pH 3.4 so it can be used with copper peptides. If you want to be extra cautious you can use them at opposite times of day.

Here's Angie's deep dive video on Vitamin C & copper peptides: https://www.youtube.com/watch?v=UEvlM6u8D_M