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Ph of facial serum
I made facial serum, results are good my question is do i must need to check ph of this serum?
My formula based on
Distilled waterCocumber extractHyaluronic acid
Niacinamide
1,3 propanidial
GlycrinPreservative is liquid germal plusFormula is going very well with more using for last 10 months but i am confused about ph level it is must to check the level of its ph?
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