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on 9/6/18This Serum is like one of THE most popular Vitamin C Serums on Amazon with ten thousand reviews! There has to be a good reason for that so, I suggest you don't go for low budget alternatives:-) Its only 20 dollars or something anyway!
I've heard of a product called Sunday Riley Vitamin C serum which is similar but actually more expensive... there's also the Drunk Elephant version both are in a higher range. In fact I think TruSkin is the cheapest AND the best!