C.E.O. 15% Vitamin C Brightening Serum.

"What I'm using is a THD derivative. This is by Sunday Riley. It is a 15% vitamin C brightening serum, but it's a THD derivative. And so, what that means is it's at a different acidity, so it does not break those peptide bonds. It makes it so much better for your peptides because your peptides will continue to work. So, they're still soaked into my skin that working. This is another one I love."

"The Sunday Riley C.E.O. is a great vitamin C. Like Skinfix, it's a THD derivative rather than an ascorbic acid, so there's no waiting at all before layering it with peptides."

"When I am doing peptides on my neck, I use a THD derivative vitamin C like this one by Sunday Riley instead of the L-ascorbic acid version, because it is slower reacting and gives the peptide a chance to soak in and do its job before the vitamin C breaks those bonds."

"If you're using peptides, you can switch to a THD derivative vitamin C like this one by Sunday Riley. It's great for sensitive skin because it's only 15% vitamin C with a different pH balance than an L-ascorbic acid, and I love it."

"This one is an absolute disaster in a bottle"

"It's £70 for 13 mil so it's very expensive. The second ingredient here is Tetra hexyl decyl ascorbate, which means it's a high percentage and actually this is one of the most expensive forms of vitamin C. It's fat soluble, it's one of my favorite forms of vitamin C for skin of color. The negatives with this is that they've gone to town with the fragrance they put in lemon citrus oil plus fragrance. It's a bit sticky, it doesn't penetrate as easily. It gives you more of a gloss finish on top of the skin."

"The Sunday Riley CEO 15% Vitamin C Brightening serum uses a vitamin C derivative, Tetrahexyldecyl Ascorbate, which is also great for people with more reactive skin who can't tolerate L-Ascorbic acid. The downside, other than it being quite expensive, is that it has quite a few essential oils, so if you're switching to a derivative because your skin is so reactive, this might not be the best choice. It's really a treat to yourself because it smells divine and has an amazing texture, but still I'll go back to Geek & Gorgeous."

"The Sunday Riley C.E.O. Serum feels like a lotion when applied, is white, and has a beautiful, subtle citrussy scent. The website recommends two pumps morning and night, but one pump is enough to cover the face and take it down the neck. It uses Tetrahexyldecyl Ascorbate rather than L-Ascorbic Acid, which has a lower irritation potential and can be used twice a day and alongside other actives. Squalane sits high up on the ingredient list, giving it a lotion-like texture, along with other moisturizing and hydrating ingredients like glycerin, and it can work as the last step in a routine without needing an additional moisturizer, especially if your skin is oily in summer. It also has vitamin E as an additional antioxidant, but alongside a whole lot of fragrant essential oils from the citrus family plus limonene and linalool, which kind of counteracts the benefit of choosing a gentler vitamin C for sensitive skin, so I wouldn't wholeheartedly support the recommendation of this product for sensitive skin. It has a beautiful texture and a lovely scent that makes the routine feel more luxurious, and it could be a great fit for those with maturing skin looking for a gentler vitamin C option or for anyone who struggles with irritation from L-Ascorbic Acid but still wants antioxidant benefits, if the price point is within your range. I do recommend patch testing first, especially if you're prone to reactions from fragrant essential oils."

"The Sunday Riley C.E.O. the 15% THD ascorbate vitamin C serum, if I start going back to vitamin C again in my peptide break morning skincare routine, 100% I'm going to be using this one. So this is an absolute holy grail in the vitamin C category."

"Sunday Riley is really really good it's one of my favorite."

"Sunday Riley CEO 15% Vitamin C serum is a formula that will work on all skin types."

"The one vitamin C that I love that has worked for me even though I have acne prone skin is the Sunday Riley 15% and I think it's because it's THD Corbit which is a slightly different formula than ethyl ascorbic acid, which kind of works better for me."

"Sunday Riley has a tetrahexyldecyl ascorbate, THD ascorbate form of vitamin C serum as well that is sold at Dermtore that one also contains glycolic acid to help your skin cell turnover. It's at a little bit less of a price point."

"This one by Sunday Riley, the 15% Vitamin C Brightening Serum, it also has that THD ascorbate in it. This is going to save you some money, not a lot, it's $85."

"I love this option if you've already tried the lower percentage and you're ready for something more. No irritation, you're going to go up to this one. Or if you have redness prone skin because this has some added ingredients into it to reduce redness of the skin, which is such a problem for me, it's such something I struggle with. So this is a really good option for wanting vitamin C benefits, sensitive skin, rosacea prone, redness skin. I love this option for that group of people."

"This has 15% THD in it, it's kind of a serum thin lotion texture, it has a slight scent of oranges or tangerine peel to it, it also has glycolic acid in it for skin texture improvement and phytosterols to reduce redness of the skin. I love that we know the percentage of THD in this product. I think overall it is a very fabulous formulation for my vitamin C hack here, but it's not my favorite. It is very good. This one is $85."

"The Sunday Riley CEO is definitely developed a cult following and a lot of people absolutely adore it. It also comes in a pump which I love so it's not exposed to oxygen constantly. The glass tube is semi-opaque, I think they could have done a little bit better, but this is a 15% THD. It does have more of an opaque finish and it also has a little bit of an oilier residue to it, but it is super fast absorbing and it has a slight citrusy scent just in case that may offend you."

"Sunday Riley C.E.O. Brightening Serum is 15 percent tetrahexyldecyl ascorbate, which is better geared towards those who have sensitive skin and who don't want to use ascorbic acid. It is an extremely runny, lightweight serum, opaque in nature. The texture is beautiful and it does not feel greasy at all. This is one that I do recommend you try if you have sensitive skin and you want to jump on the vitamin C game. It is very nice."

"Sunday Riley has their CEO Vitamin C Brightening Serum at $85 with squalane to help replenish your skin barrier. This one is also very liquid and syrupy."

"Sunday Riley's CEO 15 vitamin C brightening serum is made up with 15 percent tetrahexyldecyl ascorbate. It retails for 85 bucks. Tetrahexyldecyl is very expensive but it does help to reduce the look of redness and sensitivity."