Sunday Riley CEO Rapid Flash Brightening Serum Review
*This post contains gifted items

Welcome Skintellectuals!

I love the idea of using Vitamin C in a routine, as an antioxidant Vitamin C protects your skin from free radical damage as well as improving the look aging, brighten an uneven skin tone, as well as providing skin-restoring and soothing benefits but the pure form of Vitamin C L-Ascorbic Acid can often be quite irritating and me being one of them i often have trouble using pure L-Ascorbic Acid as its too irritating for me its one of the very few ingredients my skin doesn’t get on with.

I was really excited to try out the CEO serum from Sunday Riley because it contains a form of Vitamin C called Tetrahexyldecyl Ascorbate or THD Ascorbate for short and is much less irritating to the skin.

Sunday Riley CEO Rapid Flash Brightening Serum Review

I really like THD Ascorbate because not only is it a stable form of Vitamin C it is also oil soluble so there better chance of it being absorbed into the skin even more so than the pure L-Ascorbic Acid. I feel like if your skin can tolerate the pure L-Ascorbic Acid then go for it as its the gold standard of Vitamin C (THD isnt gold star no matter what Sunday Riley says) i feel like THD Ascorbate is better for those of you who cant handle other forms of Vitamin C.

CEO Serum feels like a cream it is quite thick and tends to spread well but once it settles down you can kind of feel it still on the skin for a while which might be a drawback for you. I have been using this for a number of months now and i have been trying to use it at every chance i get and while its not L-Ascorbic Acid, I do feel like it has made a difference in terms of my skin does look a little brighter and more even but that could be attributed to the Adapalene that im using in my routine at night. i do believe that even though you cant see the antioxidant effects it does work in that sense so Vitamin C is still of use to me.

Sunday Riley CEO Rapid Flash Brightening Serum Review


Water solv, Tetrahexyldecyl Ascorbate aox|sb, Squalane sii|emo 0 1, Hydrogenated Polydecene emo, Polyglyceryl-6 Distearate emu, Jojoba Esters so|emo|h, Polyglyceryl-3 Beeswax emu, Cetyl Alcohol emo|emu|vc 2 2, Acetamidoethoxyethanol h, Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer vc, Ppg-12/Smdi Copolymer emo, Phenoxyethanol pres, Glycolic Acid exf, Hydrogenated Lecithin emo|emu, Saccharide Isomerate h, Glycine Soja Sterols emo, Sodium Phytate chel, Tocopherol aox 03 03, Citrus Reticulata (Tangerine) Peel Oil perf, Citrus Aurantium Dulcis (Sweet Orange) Oil perf, Chlorphenesin pres|amic, Caprylyl Glycol h|emo
Hover the mouse / tap over an ingredient for short explanation. Read more on INCIDecoder.

There is a drawback in the formula in my opinion though and that’s the inclusion of Sweet Orange Oil which is a fragrant essential oil which is known for its ability to cause irritation in the skin. I honestly dont understand why they would put something like this in the formula it doesn’t need to smell of oranges to be effective and fact that it could irritate the skin further is just stupid to me.

While i do like this product as it is a high dose of Vitamin C at 15% you have to know that your never going to get the same results as you would with a pure L-Ascorbic Acid, it might take longer to get the results you are looking for and if you’re willing to hold out that long then go for it but this definitely isn’t a serum you absolutely need in your life. If CEO Serum is out of your price range you could check out something like The Ordinary Ascorbyl Tetraisopalmitate Solution 20% this contains THD Ascorbate and is a fraction of the price.

You can find the Sunday Riley CEO Rapid Flash Brightening Serum online and instore at for £70*

6.2 Overall


High percentage of THD Ascorbate



Inclusion of fragrant essential oils

The Sunday Riley CEO Serum is highly potent and absorbs into the skin easily. It is infused with vitamin C and features essential ingredients that help to enhance the complexion. Simply add this product to any routine by applying a small amount of the serum onto clean skin every morning and evening.
How well does it work?
Worth the price tag

What is your favourite Vitamin C?
Have you used THD Ascorbate?
Leave a Comment!


shireenplatt 20th February 2019
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I respect your honesty and I do have a sample of this and will give it a try. I don't think I will be purchasing the full size, I think there are so many Vitamin C serum that give better results and with a smaller price tag.

fatou 18th February 2019
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I love CEO!! xx

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