Vitamin c serum
Here guys is the list of ingredients for Cosrx vitamin c serum and they made use of mostly ascorbic acid and so many extracts so using L'ascorbic acid, guava leaves extract, sandalwood extract, neem leaf extract , green tea and Matcha tea extract, goji berry liquid, black seed extract, phenoxyethanol and germall plus and licorice root extract, are those yum to go? Pardon my layman use of words but I have no chemistry background. Thanks fam!
inx vitamin c serum


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I can say that none of the extracts listed in this formula are doing anything. If you got rid of all of them you wouldn't notice.
I also doubt the product does anything at all except maybe moisturize the skin for a few moments.
Anyone can write anything about anything on the Internet.
Of course Cosrx is going to have positive reviews on their website. They are in business to get people to buy their product. That doesn't mean what you see posted is true.
Anyway, I don't know what you mean by "boost its efficacy". What specifically is the serum supposed to be doing and what do you want to "boost"?
If you are talking about skin lightening, no incorporating ferulic acid and vitamin E will not make it lighten skin