I've got some Philosophy Vitamin C powder which I've mixed unsucessfully with a couple of my staples like Olay Total Effects moisturiser/spf 15, and Joey's Calm and Correct serum but it seems to be a bad mixer insofar as it reacts with some creams/serums. It turned Joey's serum into water! ??? Completely changed the consistency of the serum. It also added an even more visible whiter cast to my skin through the Olay. (In each case it didn't irritate my skin.)

Does anybody use Vitamin C powder successfully with lotions/serums other than skin lighteners?

What would you recommend I mix it with (other than skin lighteners which I don't need)?

Would you mix it with Relastin (instead of layering Relastin over a Vitamin C product as recommended by Dr Baumann)?
Thanks!
ironia