C Tetra Advanced.

"Of all the Medik8 vitamin C's, this is my favorite. It actually uses one of the highest potency vitamin C derivatives on the market, so you're really getting that gentle yet super effective dose of vitamin C. Vitamin C derivatives are much better for people with sensitivity-prone skin. You don't get any prickling or any sensitivity from this, but it gives you the nicest glow up. Use this for a week, and by the end of that seven days, you'll be glowing to the gods. Honestly, this has given me a better glow than any other vitamin C I've tried. It's got all the antioxidants in here, and because it's got exosomes in, that's how they get that vitamin C derivative to work so hard. They use those exosomes to really push the product into the skin and deliver it to where it needs to be in order to get that maximum results. This is something genuinely really special. I don't think I've skipped a single day since. If you hate the hot dog smell that usually comes with vitamin C, get this because it just has the nicest scent to it ever. Not hot dog watery at all. It's almost like a botanical scent to it."