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What % of Sodium Benzoate (and) Potassium Sorbate in Euxyl K712?
Hello! I hope someone can help me. I am fairly new to skincare formulation. I would like to formulate an unscented facial mist and facial serum for mature and sensitive skin. I would like to avoid parabens and formaldehyde donors in preservatives. I am considering Euxyl K712 (INCI: Sodium Benzoate (and) Potassium Sorbate (and) Aqua. I cannot find a vendor for small quantities for this preservative in the USA, but it seems that I could easily purchase the three ingredients that make up this preservative. Could someone please advise me if it is OK to add Sodium Benzoate and Potassium Sorbate separately to my formulation and at what percentage would each ingredient be included? I do plan to include in my formulation propanediol 1,3, sodium phytate and will adjust the pH with Sodium Citrate. I understand these boost the preservative. Thank you very much for your help!
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6 Replies
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These 2 organic acid compose a pretty weak system. What is your pH?
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5.0 or below. Thank you very much!
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2500-3000 ppm of each - buy think you need also something more directed at Gram negative bacteria - maybe phenoxy.
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This reply was modified 4 weeks ago by PhilGeis.
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Thank you very much! Please forgive my ignorance, what percentage would 2500-3000 ppm equate to in a cosmetic formulation? Thank you!
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Sure - 1000 ppm -= 0.1%
So 0.25-0.30%
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This reply was modified 4 weeks ago by
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Thank you very much! I wonder if you could recommend any other ingredient or preservative that is considered natural and effective against gram-negative bacteria. Thank you very much!
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