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I have been using eye ester C serum for 2 weeks with good results specially reducing dark circles under my eyes! But if I use it 2 times a day, at night I get a strong tingling sensation on my tongue for 20-30 mins. I want to buy other Perricone products, but I wonder which ingredient in the ester C serum is producing this reaction??
Hi Vanessa. We haven’t heard of this before. We recommend that you check with your physician if you continue to experience the sensation.