I have used vitamin C from different brands and never had any issues. I've also used Retinol and my skin has always been fine. My skin is used to using acids as I have acne prone skin and every beauty therapist has mentioned I have quite thick skin. Well... after using this product for 3 days, I am having the worst reaction possible ever. My entire face is red, inflamed and burning, as if I were having the worst alergic reaction ever. Not happy, as I did a patch test and it's an expensive product. I would recommend using this as with retinol, only a couple times a week, at least to start with - no more.

This serum really does brighten the skin. I have been using it every morning and my skin looks so much healthier and brighter already . I love how lightweight the serum is and it absorbs quickly into your skin . 

It is a scandal that essential oils and fragrance exist in a vitamic C product (or any other product, to be honest). It broke my skin barrier in a way that not even potent retinol could ever do, and it took a long time to bring my (more or less healthy) skin back to normal. In general, I feel that Medik8 sets very high standards with its prices, and rarely fulfills, unlike PC products that are almost always on spot and safe to use.

Very effective and active vitamin C. I really trust Medik 8 as an actives brand. Everything I’ve tried of theirs had been really solid and this is no less. 

Great texture. Super light and ungreasy, not at all sticky. After applying you can’t notice it’s there. Works great under other creams.  

I’ve been buying this for 18 months now. Super Vit C. Very similar to other vit C ferulic thats well over twice the price. Lovely texture. Will keep buying 

This is the best vitamin C serum I have ever tried. It's not sticky and soaks into your skin quickly. It gives your skin a fresh, beautiful glow. Highly recommend.