whenfarhanareviews review for Pure Vitamin C21.5% Advanced Serum

A couple of things that I don’t particularly like about this product and similar Vitamin C serums is the occasional residue left behind and the fickleness of Ascorbic Acid in general LOL! Higher concentrations of this ingredient can sometimes be harder for the skin to absorb…which leaves a slightly sticky or tacky residue behind. While I tend to use this product every AM out of habit, there is no reason why this cant be used every other day or every third day with a good result. In fact, a few articles I’ve read state that Vitamin C is stored in the skin (almost like a “reservoir”) for up to 3 days…so I am probably overusing this product a bit. Storage of Vitamin C in this format can be a hassle too. The packaging recommends keeping this in the refrigerator once opened…which for some people may already be a deal breaker LOL! Having to run from the vanity to the fridge in the middle of your routine is annoying. Or simply remembering to grab it beforehand or at all LOL! If left at too cool of a temperature…these types of products can start to crystallize. Little “rock like” balls of Vitamin C begin to form possibly impacting the efficacy and/or clogging the dropper. I had this problem with both the Cosrx Triple C Lightning Liquid and the By Wishtrend Pure Vitamin C 21.5% Advanced Serum. It took me moving the bottle around in my fridge to finally find a spot it was happy in. More recently, I have taken to simply leaving it in my cool/dark/relatively even temperature towel closet in the bathroom. I haven’t seen any of the discoloration or oxidation that can happen so I’ve been lucky. But, when in doubt, follow the instructions as written on the package.