Supreme Serum 20®

Easy to use, C 20 serum and Ferulic. Wonderful feel, instantly absorbed, great value.

I’ve been using Cosmetic Skin Solutioins Vitamin C 20 every morning for several years. I’m 70 and frequently get compliments on my skin. This serum always arrives crystal clear. I now buy a large bottle, pour some of it into a smaller CSS bottle, and store the large one in my refrigerator. It holds for months. This vitamin C serum is reasonably price and of an excellent quality. I highly recommend it!

At almost 70 years of age, I have used many vitamin C serums, some that are ridiculously expensive. I keep coming back to this one because I do see noticeably softer, brighter skin. It doesn’t seem to oxidize as quickly as others I have used and the price point is great. I am impressed with how CSS appears to put much effort into the research and development of their products. Will continue to use this and other CSS products.

I started to use vitamin C serum for brighter skin. This product has the highest % as far as I know on the market and it does not irritate my skin. And I have very sensitive skin. I've been using this for almost 2 years and noticed distinguished improvement in skin brightness and texture. I wouldn't say it can make any difference in a week or two but I don't think any other products can do that. That's just the way it it. But with consistent use, it can definitely improve skin tone and texture. My skin is at least one tone brighter than 2 years ago. I use it in the morning and always put on sunscreen, even at home because vitamin C is super oxidative under UV light.

I started to use vitamin C serum for brighter skin. This product has the highest % as far as I know on the market and it does not irritate my skin. And I have very sensitive skin. I've been using this for almost 2 years and noticed distinguished improvement in skin brightness and texture. I wouldn't say it can make any difference in a week or two but I don't think any other products can do that. That's just the way it it. But with consistent use, it can definitely improve skin tone and texture. My skin is at least one tone brighter than 2 years ago. I use it in the morning and always put on sunscreen, even at home because vitamin C is super oxidative under UV light.