DHA stability

Hi Everyone,

Just wanted to check what pH DHA is most stable at in creams. Also does it react with phenoxyethanol? What are suitable preservatives?



  • MicroformulationMicroformulation Member, Professional Chemist
    DHA is most stable at a pH in the range of 4. Over time the cream will migrate down to about 3.9 pH. It will preserve with phenoxyethanol. It does react with proteins and iron oxides. It works best with nonionic emulsifiers.

    I have had good results with PE9010 as a preservative.

    I have made too many of these products to count. The real secret is treating your DHA as an expendable. Keep it refrigerated until you use it.
    markfuller@microformulation.com Microformulation.com Microformulation Cosmetic Consulting provides Custom Formulations for both large Commercial accounts as well as smaller entrepreneurs. We can provide Naturally compliant Formulations under the NSF, NPA, Whole Foods and USDA Organic Certifications. BS.Pharm Albany College of Pharmacy, Union University.
  • MarkBroussardMarkBroussard Member, Professional Chemist
    You might also consider adding some 1,2-Pentylene Glycol to your formulation.
    Chemist/Microbiologist formulating in the Organic & Naturals & Clean Beauty arena under ECOCert/Natural Products Assn/Whole Foods/National Organic Program/Clean At Sephora/Credo Clean guidelines focused skincare & haircare products. 

    See website for details www.desertinbloomcosmeticslab.com
  • Thanks for that. I am not sure why i was told not to use phenoxyethanoll then as a preservative.
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