JO - ★★★★
Small serum, only 15mL, looks affordable but comparing to the usual size of serums 30mL quite pricey. Though understandable. Once opened even when packaged in the airless bottle, vitC goes off quite rapidly in water based formulations. So 15mL is perfect size when used daily without deterioration. Serum lasted me about a month and a half, I used it daily 2 times , even before bed. It is recomended to use this booster mornings only preferably and on its own that I did. Leaving my skin smooth to tough with a bit of glow. In the PM I layered it with my other skincare and moisturizer, but placing it first on well cleansed skin. In this time there was no huge difference in my pigmentation. Just smooth skin and very healthy looking. With good healthy glow. I use vitC regularly in my skincare routine. And with this serum I had no issues with tingling or irritation.