Citrate Buffer
Reviewed by Daisy · Last updated 14 Aug 2026
Also known as: Citric Acid, Sodium Citrate
Citrate buffer is a buffered mixture of the cosmetic ingredients
EWG Safety Score
What Is Citrate Buffer?
Citrate buffer is a buffered mixture of the cosmetic ingredients sodium citrate and citric acid. It functions in cosmetics as a pH-adjusting ingredient to keep products in the acidic range of the pH scale. It can be sensitizing when used in high amounts, but the tiny amounts needed to establish a pH in cosmetics are not harmful to skin.
Clinical Evidence & References
Published Research
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International Journal of Pharmaceutics, May 2017, pages 222-231 []
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Results in Pharma Sciences, May 2011, pages []
From the Clinic
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Ajuga Reptans Cell Culture Extract
Plant cell culture extract with antioxidant and skin-brightening potential
Calcium Disodium EDTA
A chelating agent that binds metals and helps stabilise skincare formulations
Caprylhydroxamic Acid
A chelating agent that stabilises formulations and supports product efficacy
Citric Acid
Used in small amounts to adjust the pH of products | Originally derived from citrus fruits
Citrus Medica Vulgaris Fruit Extract
A citrus-derived antioxidant that helps protect skin from environmental stressors
Cyclodextrin
Derived from cornstarch and made via biotechnology | Used in cosmetics to stabilise and help solubilize key ingredients
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