Foxp3 and Toll-like receptor signaling balance T(reg) cell anabolic metabolism for suppression
Its definitely a smart thing to avoid with sensitive skin (and fragrance of any type - natural is just as allergic as synthetic, if not worse!).
In theory, ingredients like high-concentration L-ascorbic acid (vitamin C) or strong alpha-hydroxy acids can alter the pH environment and may interfere with the copper-peptide complex or compound irritation when applied at the same time
If you are low in B, an appropriate supplementation will be added
If that happens, and then you got the brick, and it's already made up and ready to go, now all of a sudden, your body says, okay, if I have the bricks, I don't have to make the bricks, I can use the same energy to do the work because the labor force is still the same
Marjot, T., Moolla, A., Cobbold, J