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Vitamin C (Ascorbic Acid)
At ORY®, we believe you should know what’s in your products and why. This page lists the published research behind what we say about ascorbic acid (vitamin C). Each section starts with our claim, then tells you how well the research supports it, then lists the sources so you can read them yourself.
How to read this page Supported — backed by peer-reviewed research or official safety reviews. Supported, with caveats — the research points this way, but mostly from laboratory or animal studies, or at different strengths than ORY® uses. Limited evidence — little or no published research yet. We say so openly. |
1. General Description and Role
Claim: Vitamin C (L-ascorbic acid) is an antioxidant. In ORY® products, it helps skin look brighter and more even and provides antioxidant support. ORY® also uses stable vitamin C derivatives in some products. |
Verification: Supported. The Cosmetic Ingredient Review (CIR) Expert Panel concluded that L-ascorbic acid and several of its salts and derivatives, including sodium and magnesium ascorbyl phosphate, are safe as used in cosmetics.
Citations:
- Elmore, A. R. (2005). Final report of the safety assessment of L-ascorbic acid, calcium ascorbate, magnesium ascorbate, magnesium ascorbyl phosphate, sodium ascorbate, and sodium ascorbyl phosphate as used in cosmetics. International Journal of Toxicology, 24(Suppl 2), 51–111. https://doi.org/10.1080/10915810590953851
- What it shows: CIR safety assessment (2005).
- Elmore, A. R. (2005). Final report of the safety assessment of L-ascorbic acid, calcium ascorbate, magnesium ascorbate, magnesium ascorbyl phosphate, sodium ascorbate, and sodium ascorbyl phosphate as used in cosmetics. International Journal of Toxicology, 24(Suppl 2), 51–111. https://doi.org/10.1080/10915810590953851
2. Composition and Production
Claim: L-ascorbic acid is made by fermenting glucose. It is water-soluble and oxidizes easily, so it needs a low pH, airless opaque packaging, and fresh preparation. Derivatives such as sodium ascorbyl phosphate, ascorbyl glucoside, and tetrahexyldecyl ascorbate are more stable. |
Verification: Supported. Absorption studies found that L-ascorbic acid enters skin best at a pH below about 3.5.
Citations:
- Pinnell, S. R., Yang, H., Omar, M., et al. (2001). Topical L-ascorbic acid: Percutaneous absorption studies. Dermatologic Surgery, 27(2), 137–142. https://doi.org/10.1046/j.1524-4725.2001.00264.x
- What it shows: Skin absorption studies.
- Elmore, A. R. (2005). Final report of the safety assessment of L-ascorbic acid, calcium ascorbate, magnesium ascorbate, magnesium ascorbyl phosphate, sodium ascorbate, and sodium ascorbyl phosphate as used in cosmetics. International Journal of Toxicology, 24(Suppl 2), 51–111. https://doi.org/10.1080/10915810590953851
- What it shows: Describes chemistry.
- Pinnell, S. R., Yang, H., Omar, M., et al. (2001). Topical L-ascorbic acid: Percutaneous absorption studies. Dermatologic Surgery, 27(2), 137–142. https://doi.org/10.1046/j.1524-4725.2001.00264.x
3. Skin Type Suitability
Claim: Vitamin C suits most skin types; ORY® matches the form to the skin’s tolerance. |
Verification: Supported, with caveats. Low-pH L-ascorbic acid serums can sting; gentler derivatives at higher pH suit sensitive skin. Reviews describe vitamin C’s role in skin.
Citations:
- Al-Niaimi, F., & Chiang, N. Y. Z. (2017). Topical vitamin C and the skin: Mechanisms of action and clinical applications. Journal of Clinical and Aesthetic Dermatology, 10(7), 14–17. https://pubmed.ncbi.nlm.nih.gov/29104718/
- What it shows: Review of topical vitamin C.
- Pullar, J. M., Carr, A. C., & Vissers, M. C. M. (2017). The roles of vitamin C in skin health. Nutrients, 9(8), 866. https://doi.org/10.3390/nu9080866
- What it shows: Review of vitamin C in skin health.
- Al-Niaimi, F., & Chiang, N. Y. Z. (2017). Topical vitamin C and the skin: Mechanisms of action and clinical applications. Journal of Clinical and Aesthetic Dermatology, 10(7), 14–17. https://pubmed.ncbi.nlm.nih.gov/29104718/
4. Hair and Scalp Suitability
Claim: In haircare, vitamin C derivatives add antioxidant support to scalp serums. |
Verification: Limited evidence. We found no clinical study of topical vitamin C for hair. ORY® does not make hair-growth claims.
Citations:
- U.S. Food and Drug Administration. 21 CFR 310.527 — Drug products offered over-the-counter for external use as hair growers or for hair loss prevention. https://www.law.cornell.edu/cfr/text/21/310.527
- What it shows: FDA treats hair-growth claims as drug claims.
- U.S. Food and Drug Administration. 21 CFR 310.527 — Drug products offered over-the-counter for external use as hair growers or for hair loss prevention. https://www.law.cornell.edu/cfr/text/21/310.527
5. Benefits
Claim: Vitamin C helps skin look brighter, smoother, and more even-toned. |
Verification: Supported, with caveats. In a double-blind, placebo-controlled study, a topical ascorbic acid cream improved the look of photoaged skin. Reviews describe antioxidant and brightening effects. Antioxidants do not replace sunscreen, and ORY® does not make sun-protection claims for this ingredient; SPF claims are drug claims under FDA rules. ORY® does not make acne claims for vitamin C derivatives.
Citations:
- Humbert, P. G., Haftek, M., Creidi, P., et al. (2003). Topical ascorbic acid on photoaged skin. Clinical, topographical and ultrastructural evaluation: Double-blind study vs. placebo. Experimental Dermatology, 12(3), 237–244. https://doi.org/10.1034/j.1600-0625.2003.00008.x
- What it shows: Double-blind, placebo-controlled study.
- Al-Niaimi, F., & Chiang, N. Y. Z. (2017). Topical vitamin C and the skin: Mechanisms of action and clinical applications. Journal of Clinical and Aesthetic Dermatology, 10(7), 14–17. https://pubmed.ncbi.nlm.nih.gov/29104718/
- What it shows: Review.
- U.S. Food and Drug Administration. (2019, February 26). Sunscreen drug products for over-the-counter human use (proposed rule), 84 FR 6204. https://www.federalregister.gov/documents/2019/02/26/2019-03019/sunscreen-drug-products-for-over-the-counter-human-use
- What it shows: FDA sunscreen rules.
- U.S. Food and Drug Administration. 21 CFR Part 333, Subpart D — Topical acne drug products for over-the-counter human use. https://www.ecfr.gov/current/title-21/chapter-I/subchapter-D/part-333/subpart-D
- What it shows: FDA acne drug rule.
- Humbert, P. G., Haftek, M., Creidi, P., et al. (2003). Topical ascorbic acid on photoaged skin. Clinical, topographical and ultrastructural evaluation: Double-blind study vs. placebo. Experimental Dermatology, 12(3), 237–244. https://doi.org/10.1034/j.1600-0625.2003.00008.x
6. Use Across ORY® Product Lines
Claim: Vitamin C is used in ORY® Skincare, Cosmetics (derivatives), and some scalp serums. It is not used in soap. |
Verification: Supported. It is destroyed at the high pH of soap.
| Product line | Typical level | How ORY® uses it |
| Skincare | 10–20% L-AA; 1–5% derivatives | Serums (pH 3–3.5, airless), derivative serums, creams, and eye creams. |
| Haircare | 0.5–2% derivatives | Scalp antioxidant serums. |
| Handmade Soap | Not used | Oxidizes at soap pH. |
| Cosmetics | 0.5–3% derivatives | Foundations, primers, and lip products. |
Citations:
- Elmore, A. R. (2005). Final report of the safety assessment of L-ascorbic acid, calcium ascorbate, magnesium ascorbate, magnesium ascorbyl phosphate, sodium ascorbate, and sodium ascorbyl phosphate as used in cosmetics. International Journal of Toxicology, 24(Suppl 2), 51–111. https://doi.org/10.1080/10915810590953851
- What it shows: Reported uses.
- U.S. Food and Drug Administration. 21 CFR 701.20 — Definition of “soap” (only true soap, made mainly of alkali salts of fatty acids and sold only as soap, is exempt from cosmetic rules). https://www.ecfr.gov/current/title-21/chapter-I/subchapter-G/part-701/subpart-B/section-701.20
- What it shows: FDA definition of soap; other bars are cosmetics.
- Elmore, A. R. (2005). Final report of the safety assessment of L-ascorbic acid, calcium ascorbate, magnesium ascorbate, magnesium ascorbyl phosphate, sodium ascorbate, and sodium ascorbyl phosphate as used in cosmetics. International Journal of Toxicology, 24(Suppl 2), 51–111. https://doi.org/10.1080/10915810590953851
7. Pros
Claim: A well-studied antioxidant with placebo-controlled evidence and a CIR safety conclusion. |
Verification: Supported. Supported by clinical and review evidence.
Citations:
- Humbert, P. G., Haftek, M., Creidi, P., et al. (2003). Topical ascorbic acid on photoaged skin. Clinical, topographical and ultrastructural evaluation: Double-blind study vs. placebo. Experimental Dermatology, 12(3), 237–244. https://doi.org/10.1034/j.1600-0625.2003.00008.x
- What it shows: Clinical study.
- Elmore, A. R. (2005). Final report of the safety assessment of L-ascorbic acid, calcium ascorbate, magnesium ascorbate, magnesium ascorbyl phosphate, sodium ascorbate, and sodium ascorbyl phosphate as used in cosmetics. International Journal of Toxicology, 24(Suppl 2), 51–111. https://doi.org/10.1080/10915810590953851
- What it shows: Safety conclusion.
- Humbert, P. G., Haftek, M., Creidi, P., et al. (2003). Topical ascorbic acid on photoaged skin. Clinical, topographical and ultrastructural evaluation: Double-blind study vs. placebo. Experimental Dermatology, 12(3), 237–244. https://doi.org/10.1034/j.1600-0625.2003.00008.x
8. Cons
Claim: Pure vitamin C is unstable and can sting. |
Verification: Supported. We list these limits so you have the full picture:
- Unstable. Oxidizes in water, light, and air; discard if it turns yellow-brown.
- Stinging. Low pH can irritate sensitive skin.
- Derivatives are gentler but weaker.
- Not with benzoyl peroxide in the same application.
Citations:
- Pinnell, S. R., Yang, H., Omar, M., et al. (2001). Topical L-ascorbic acid: Percutaneous absorption studies. Dermatologic Surgery, 27(2), 137–142. https://doi.org/10.1046/j.1524-4725.2001.00264.x
- What it shows: pH and stability.
- Pinnell, S. R., Yang, H., Omar, M., et al. (2001). Topical L-ascorbic acid: Percutaneous absorption studies. Dermatologic Surgery, 27(2), 137–142. https://doi.org/10.1046/j.1524-4725.2001.00264.x
9. Safety Notes
Claim: Patch test before use; for external use only. |
Verification: Supported. Follow these precautions:
- Patch test any new product on a small area for 24–48 hours before full use.
- Use sunscreen daily; vitamin C does not replace it.
- Discard L-ascorbic acid serums that turn yellow-brown.
- Stop use if redness, burning, itching, or rash occurs, and talk to a healthcare provider.
- For external use only. Avoid the eyes unless the product is made for the eye area.
- If you are pregnant, nursing, have a medical condition, or are buying for a child, ask a healthcare provider before use.
Citations:
- Elmore, A. R. (2005). Final report of the safety assessment of L-ascorbic acid, calcium ascorbate, magnesium ascorbate, magnesium ascorbyl phosphate, sodium ascorbate, and sodium ascorbyl phosphate as used in cosmetics. International Journal of Toxicology, 24(Suppl 2), 51–111. https://doi.org/10.1080/10915810590953851
- What it shows: Safety conclusion.
- Elmore, A. R. (2005). Final report of the safety assessment of L-ascorbic acid, calcium ascorbate, magnesium ascorbate, magnesium ascorbyl phosphate, sodium ascorbate, and sodium ascorbyl phosphate as used in cosmetics. International Journal of Toxicology, 24(Suppl 2), 51–111. https://doi.org/10.1080/10915810590953851
10. Product-line notes
- ORY® Skincare: For external use only. Not for deep or puncture wounds, animal bites, or serious burns.
- ORY® Haircare: Designed for the look and feel of hair and scalp comfort. Not intended to treat dandruff or scalp conditions, or to promote hair growth or prevent hair loss.
- ORY® Handmade Soap: Vitamin C is not used in ORY® soap.
- ORY® Cosmetics: Do not share applicators, and replace any product that changes color, smell, or texture.
11. References
Peer-reviewed research
- Al-Niaimi, F., & Chiang, N. Y. Z. (2017). Topical vitamin C and the skin: Mechanisms of action and clinical applications. Journal of Clinical and Aesthetic Dermatology, 10(7), 14–17. https://pubmed.ncbi.nlm.nih.gov/29104718/
- Elmore, A. R. (2005). Final report of the safety assessment of L-ascorbic acid, calcium ascorbate, magnesium ascorbate, magnesium ascorbyl phosphate, sodium ascorbate, and sodium ascorbyl phosphate as used in cosmetics. International Journal of Toxicology, 24(Suppl 2), 51–111. https://doi.org/10.1080/10915810590953851
- Humbert, P. G., Haftek, M., Creidi, P., et al. (2003). Topical ascorbic acid on photoaged skin. Clinical, topographical and ultrastructural evaluation: Double-blind study vs. placebo. Experimental Dermatology, 12(3), 237–244. https://doi.org/10.1034/j.1600-0625.2003.00008.x
- Pinnell, S. R., Yang, H., Omar, M., et al. (2001). Topical L-ascorbic acid: Percutaneous absorption studies. Dermatologic Surgery, 27(2), 137–142. https://doi.org/10.1046/j.1524-4725.2001.00264.x
- Pullar, J. M., Carr, A. C., & Vissers, M. C. M. (2017). The roles of vitamin C in skin health. Nutrients, 9(8), 866. https://doi.org/10.3390/nu9080866
Government and regulatory sources
- U.S. Food and Drug Administration. (2019, February 26). Sunscreen drug products for over-the-counter human use (proposed rule), 84 FR 6204. https://www.federalregister.gov/documents/2019/02/26/2019-03019/sunscreen-drug-products-for-over-the-counter-human-use
- U.S. Food and Drug Administration. 21 CFR Part 333, Subpart D — Topical acne drug products for over-the-counter human use. https://www.ecfr.gov/current/title-21/chapter-I/subchapter-D/part-333/subpart-D
- U.S. Food and Drug Administration. 21 CFR 310.527 — Drug products offered over-the-counter for external use as hair growers or for hair loss prevention. https://www.law.cornell.edu/cfr/text/21/310.527
- U.S. Food and Drug Administration. 21 CFR 701.20 — Definition of “soap” (only true soap, made mainly of alkali salts of fatty acids and sold only as soap, is exempt from cosmetic rules). https://www.ecfr.gov/current/title-21/chapter-I/subchapter-G/part-701/subpart-B/section-701.20
