not necessary for daily use -
7/29/2014 7:55:51 PM
According to a popular dermatologist's blog, Citrix CRX is best used every four days in the morning for best sun protection and not mixing with any glycolic acid products. It's affects last that long even after cleansing your face. So yes, it's very expensive, but it should last a long time...one pump only. Additionally, it's airtight packaging keeps it fresh. I like the tingle too, makes me feel like there is something in it!