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Sodium Ascorbyl Phosphate

Sodium Ascorbyl Phosphate

Also-called-like-this: Form of Vitamin C, SAP
What-it-does: antioxidant, anti-acne

Official CosIng Information


The sodium salt form of skincare superstar, vitamin C. If you do not know what the big fuss about vitamin C is, you are missing out and you have to click here and read all the geeky details about it.

Pure vitamin C (aka ascorbic acid, AA) is great and all, but its lack of stability is a big challenge for the cosmetics industry. One solution is to create stable derivatives that can be absorbed into the skin, convert there to AA and do all the magic AA is proven to do (which is being an antioxidant, a collagen booster, and a skin brightener).

SAP (the vit C derivative, not the enterprise software, obvs) is a promising derivative that has great stability up to pH 7. The challenge with it though is skin penetration. Unfortunately, it seems to be limited, or to quote a great article from the Journal of Cosmetic Dermatology "topically applied ascorbyl phosphate salts are, at very best, poorly absorbed in comparison with AA". Regarding conversion to AA, there seems to be no data about it, so we can neither deny nor confirm it.

We have better news regarding the three magic abilities of vitamin C: there is in-vivo (tested on real people) data showing that SAP does have photo-protective (aka antioxidant) properties, though less than pure AA. SAP might also aid collagen boosting; in-vitro (made in the lab) data shows that it works, but is less effective than another vitamin C derivative, called MAP (that seems to be as effective as pure AA). As for skin-brightening, there is a trade publication with in-vivo data showing that SAP can fade brown spots

Another thing SAP might be able to do is to help with acne. A 2005 study showed in vitro (in test tubes) that 1% SAP has a strong antimicrobial activity on evil acne causing P. acnes and it also showed in vivo (on real people) that 5% SAP can strongly improve the inflammatory and non-inflammatory lesions of acne vulgaris. In fact, the results were comparable or even slightly better than with 5% benzoyl peroxide. 

And there is even more regarding SAP and acne. A nice double-blind study from 2009 showed that  5% SAP reduced the inflammatory lesions by 20.14% and 48.82% within 4 and 8 weeks respectively and when combined with 0.2% retinol the results were even better. With this combination treatment, the improvement was 29.28% after 4 weeks and 63.10% after 8 weeks of application. 

Aside from research studies, anecdotal evidence also supports SAP being a promising vitamin C derivative. One of the best-selling (vitamin C) serums in Sephora is the Ole Henriksen Truth Serum, while on Amazon it's the OzNaturals Vitamin C 20 Serum. Another popular choice is the Mad Hippie Vitamin C serum, and all of these contain vitamin C in the form of SAP. 

Overall, we think SAP is a goody!  In terms of anti-aging, it's probably not as effective as pure Ascorbic Acid, but it's totally worth a try. However, if your skin is acne-prone, SAP is your form of Vitamin C and it's a must-try.

Show me some proof

  • Journal of Cosmetic Dermatology, Volume 11 (4) – Dec 1, 2012, Stability, transdermal penetration, and cutaneous effects of ascorbic acid and its derivatives
  • Ruamrak, C., N. Lourith, and S. Natakankitkul. "Comparison of clinical efficacies of sodium ascorbyl phosphate, retinol and their combination in acne treatment." International journal of cosmetic science 31.1 (2009): 41-46.
  • Klock, Jochen, et al. "Sodium ascorbyl phosphate shows in vitro and in vivo efficacy in the prevention and treatment of acne vulgaris." International journal of cosmetic science 27.3 (2005): 171-176.
  • Woolery‐Lloyd, Heather, Leslie Baumann, and Hiroshi Ikeno. "Sodium L‐ascorbyl‐2‐phosphate 5% lotion for the treatment of acne vulgaris: a randomized, double‐blind, controlled trial." Journal of cosmetic dermatology 9.1 (2010): 22-27.

Products with a known amount of Sodium Ascorbyl Phosphate

Other products with Sodium Ascorbyl Phosphate

All Natural Advice Vitamine C Serum All Nature Advice Anti-Aging Vitamin C Serum Artnaturals Luxe Vitamin C Serum Aspect Dr Problem Skin Serum Beauty Glam Vitamin C Serum Biobellus Suero Facial Iluminador Bioelements Vc10 Daily Glow Brickell Men's Products Repairing Night Serum For Men Caviahue Serum C Chikyu Advanced Vita-C Skin Recovery Serum Derma E Vitamin C Concentrated Serum Dr Sebagh Pure Vitamin C Powder Cream Dr Sebagh Supreme Maintenance Youth Serum Eight Saints Seeking C Serum Envygreen Intensif Vitamin C Serum FLORENCE ORGANICS C Facial Serum Gin Amber Beauty Natural 20% Vitamin C Booster Gyada Cosmetics Radiance Face Serum Insta Natural Vitamin C Serum InstaNatural Age-Defying & Skin Clearing Toner InstaNatural Vitamin C Toner Kleem Organics Vitamin C Serum Liz Milano Brightening Potion Mad Hippie Hydrating Nutrient Mist Mad Hippie Vitamin C Serum Monat C. Radiance Natavis Vitamin C Serum Neogen Real Vita C Serum Neutriherbs Vitamin C Serum, 20% Vitamin C Ole Henriksen Truth Serum Olival Vitamin Serum C Paula's Choice Clinical Ceramide-Enriched Firming Moisturizer Powerganics Vitamin C Serum Radha Beauty Vitamin C Serum SVR Hydracid C50 Satin Naturel Bio Retinol Serum Satin Naturel Bio Vitamin C Serum Satin Naturel Bio Vitamin C Serum (New Version) Satin Naturel Bio Vitamin C Serum | Uniformity & Smoothness Suganda 10% Vitamin C Antioxidant Serum Suganda Antioxidant Serum Sugandha Antioxidant Serum Sympli Beautiful Vitamin C Stem Cell Serum Typology Radiance Serum 11% Vitamin C U Beauty Resurfacing Compound YOU Skincare Vitamin C Antioxidant Serum artnaturals Vitamin C Serum cleen beauty Vitamin C Papaya Glow Serum facetheory Regena 20% Vitamin C Serum C20 facetheory Regena C20 20% Stabilized Vitamin C Serum