Aspect C20 and B17

Aspect C20 and B17
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I have a questions ladies, those who use Aspect products. I am 56 with normal to dry skin and have just tried these products over the last month, wow! C20 and Phytostat 9 in the AM and B17 and Phytostat in the PM, do I need to use both serums or could I do with one?