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sodium ascorbyl phosphate

Stable, water-soluble form of vitamin C that functions as an antioxidant and is potentially effective for brightening an uneven skin tone. 

There is also research showing amounts of 1% and 5% concentrations of sodium ascorbyl phosphate can influence factors linked to breakouts. Thus, this form of vitamin C may be an effective adjunct to anti-acne products that contain benzoyl peroxide and salicylic acid.

References for this information:

Drug Research, October 2016, ePublication
Journal of Photochemistry and Photobiology, August 2009, pages 130-135
International Journal of Cosmetic Science, December 2008, pages 453-458
International Journal of Cosmetic Science, June 2005, pages 171-176

See antioxidant vitamin C

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