[Product Question] TO Vitamin C powder: what time to use and what can I mix with?

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Hello Everyone, I currently use Melano CC every morning as my Vit C serum. I mix it with my Good Molecules Niacinamide serum and it works good for me but I know that Melano CC is not that strong of a Vit C product and that's why I've been thinking about the powder version from TO.But my problem is: on their website it says to not use it during the day (I thought Vit C was more effective during the day) and to not mix it with niacinamide. So how do you guys use the powder. I just want a good concentration of Vit C without it being unstable like most serums.
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Submitted by guimarba