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Vitamin C Superserum 
+ Limited FREE Gift

Rated 4.9 out of 5
Based on 205 reviews

30 ml / 1 fl oz | 60 day treatment

the world's first and only pure, fully stabilized Vitamin C serum.


Corrects skin dullness, fades dark spots/discoloration, fills in wrinkles by boosting natural collagen production and provides ongoing age & pollutant defense


Visibly brighter, smoother and more even complexion.


10% L-ascorbic acid, pH 3.46

LIMITED October Promotion –– Choose a Free Gift:

Total Value: $126 or $120

Protocol Lab Price: $72 ($1.20 per day)

Free gift promotion is not eligible for additional discounts, including the #NEWCLIENT code.

the two most important things to look for when choosing a Vitamin C serum:

1) Is the active ingredient listed "L-Ascorbic Acid"?
2) Was it bottled in a completely oxygen-free environment?

Serums containing "ascorbyl palmitate," "tetrahexyldecyl ascorbate," "magnesium ascorbyl phosphate,"...etc. are all legally allowed to be called "Vitamin C serums," though these derivative forms to have little-to-no actual Vitamin C antioxidant power on their own. The ingredient you're looking for is l-ascorbic acid, which is the pure, natural, full-potency form of Vitamin C you'd find in a freshly-picked orange. This is also the form that will show the greatest visible benefits to your complexion. We include some derivative forms on top of l-ascorbic-acid, since your skin has some capacity to store these forms for later conversion to the real deal.

The second thing to note is that if your Vitamin C serum doesn't smell sweet and look like light yellow apple sauce, it's no longer Vitamin C. There's a lot of talk out there about "stabilized Vitamin C" created by adding water or ferulic acid. These indeed increase the stability, but if the serum is bottled with oxygen exposure, every hour it sits on the shelf it will continue to oxidize, degrade and lose its effectiveness significantly.  If you read the fine print of most of the popular ascorbic-acid serums on the market, you'll see a plea saying "don't stock up."

our solution:

All Protocol serums are created and bottled in a 100% oxygen-free and light-free environment, using patented aerospace containment technology.

Study conducted with 43 clients with varying degrees of photo-aging and hyperpigmentation symptoms, both with and without prior treatment with topical antioxidants.

why has no one else done this? because it's really, really hard. Another skincare CEO famously called it "unrealistic." our engineering team loved that.

Protocol's founding team had to look outside the skincare industry, in the aerospace and nuclear industries, to find the technology that could make oxygen-free and light-free bottling possible.  The final result is 10% ascorbic acid delivered to you exactly as nature intended it: pure and perfect.

The secret that brings it all together is what we call our "little orange ingredient fortress":

A proprietary, clinical-grade, totally airless and UV proof bottle that's built like the space shuttle to protect our advanced and fragile ingredients. The quality of product it delivers will be apparent from the first pump.

why don't we use ferulic acid? and not why not 20% ascorbic acid?

Because it smells like hot dogs. And because your skin can't use that much Vitamin C.

Ferulic acid is primarily added to ascorbic acid serums in attempt to extend the shelf life of a highly unstable serum. We do not have this problem because our serums are bottled with out oxygen exposure and using an airless bottle. Ferulic acid also boosts the sun protective properties of ascorbic acid––but nowhere close to what you can get by simply applying sunscreen (which you should do anyway!). As documented here, the most important component of topical ascorbic acid effectiveness is its pH (it must be below 3.5). This study also shows that at a proper pH (like the Protocol Vitamin C Superserum at 3.4), the skin reaches a saturation point where it cannot take on more Vitamin C after just a few days of application. Based on these recommendations, we have lowered the concentration of our serum to 10% ascorbic acid, which allows for total antioxidant saturation but with a gentler daily application. In other words, 20% is more harsh and goes to waste anyway after day 3 of use.

visible improvements guaranteed in 60 days.

Vitamin C in the ascorbic acid form is the most effective topical antioxidant by a very wide margin. (For clients interested, the second most effective is green tea extract as provided in our AHA cleanser.) No other antioxidant is proven to be as clinically effective at reversing signs of environmental stressors like UV and pollutants exposure or is proven capable of encouraging natural collagen production. Most clients see a boost in evenness and brightness to their complexion within the first week of use. The permanent fading of dark spots or hyperpigmentation can take a month or the full 60 day course to become most noticeable. We recommend at least 2-3 treatments per year with this full-potency ascorbic acid to maximize results though continuous use for ongoing correction and protection is of course ideal. Clients are encouraged to document their skin's progress using the Setlist App.

average rating 4.9 out of 5
Based on 205 reviews
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97% of reviewers would recommend this product to a friend
Customer photos and videos
205 Reviews
Reviewed by Erika
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted


I cant even express to you how much I’ve battled with hormonal cystic acne, dark hyperpigmentation, dry, and oily skin. I’ve spent thousands on peels, creams, serums, pills, and countless sad evenings researching ingredients and how they can alter your skin and gut microbiome. Through the years I’ve had to learn the hard way how paramount clean and well preserved ingredients are. After 13 years of an arduous journey- I’ve landed, with confidence, on Protocol. As we all know, Vitamin C is a cute but unstable monster, retinol is an irritating acid at certain percentages, HA is tricky without the right moisture/reactive combination but Protocol has mastered all of it with scientific sophistication. Aside from its CLEAN (non carcinogenic, paraben free, hormone-disrupter free) ingredients, the packages are ingenious (check out their page on the way no light or air penetrate the serums). Also, their customer care is the sweetest, most understanding, and most responsive I’ve dealt with.

Listen, I don’t usually freak like this over a brand but I’m telling you it will change your life and simplify your complicated skin routine. I look younger, I look fresher, I look brighter, and I feel like I can just take a breath and trust this brand. You owe it to yourself to try this. My skin made me sad for so long and with this I’m getting my confidence back every day.



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Reviewed by Kate
I recommend this product
Rated 5 out of 5
Review posted

I can't believe it

This is unbelievable. I'm 32. I've been using retinol products and "Retin-'A'" 0.05 for about 6 years. I microneedle and get red light therapy. This is the best retinol I have ever used. I've seen more results from one week of use than I have from months of "Retin-'A'". I can also use it every night without drying which is insane. I'll report back in 6 months but this is not a drill. It is. The best.

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Reviewed by Kirby O.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Fan for life.

I've had issues with my skin for the past two or so years, I think because of damage done to my skin barrier from using Biologique Recherche p50, and then other chemical exfoliants. My skin was very, very angry with me, and I responded with panic and more products. Wrong. I finally gave my skin some space to breath (thank you stay-at-home orders), and didn't put anything besides sunscreen on for two weeks - highly recommend. The first products I used again were Protocol and Avène Cicalfate+ Restorative Protective Cream (so good for sensitive skin), and my skin has never looked better. Like ever.

I have never seen these types of results, yet alone this quickly (about three months with Retinol/Vit C/Moisturizer). I use the Retinol every second or third night so I don't have bitchy skin deja-vu. The cleanser is magic, truly. So worth it. I just started using it, and every other night works best so far. I think I started out putting too much of the moisturizer on (I feel like this might have been part of my problem all along), but now that I take more time to apply instead of just slapping it on I am much happier with how my skin really absorbs the product. I use it during the daytime, and Cicalfate at night. My skin is completely different now - blemish free, less redness, super plump and strong, and I worry far less about it (the best part).

Protocol's customer service is also fantastic in general, they get that it's 2020 and they're a skincare brand. Thank you!!

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Reviewed by Sarah G.
Verified Buyer
I recommend this product
35 - 44
Skin Type
Skin Concerns
  • Acne
  • Age Defense
  • Dark Spots
  • Dullness
  • Pores
My Results
  • Glowing Skin
  • Smoother Skin
  • Firm & Lifted Skin
  • Skin Radiance
  • Softer Skin
Rated 5 out of 5
Review posted

Amazing Results!

My 43 year old stressed acneic aging skin has never looked better! The protocol line of products has brought new life to my problem skin. I feel such a sense of rejuvenation since using this line! My skin is softer, more supple, and brighter. I also see fewer fine lines and acne scars!

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Reviewed by Megan H., from United States
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

I'm obsessed!

Best retinol I have ever used! I have used almost all the retinol products through Sephora (I am Rouge status at Sephora because I spend way too much money there) and was not satisfied with many of the high priced brands. This retinol actually made my skin do the "retinol purging" where it got worse to shed all the impurities and now I have clear and soft skin. This made me know this stuff actually works. I am still on the fence about the cleanser and moisturizer- I know they both work well, but so do some of my other favorite brands. I will absolutely buy both serums again individually.

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