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1) is optimal pH of skin care 4,0- 5,0 ? 2) irritating ingredients
Hello, I would like to ask two questions:
1) What do you think about moisturizers with pH 4.0? Is cosmetics with pH 4,0 - 5,0 really better for acid mantle (knowing that skin pH is around 4,7) ?
2) Lately, I found some evidence that essential oils and their particles found in many other ingredients like flower waters, CO2 extracts, menthol, camphor are not only allergens, but might have irritating potential as well. Are you aware of some evidence based source where I can check if the ingredient is irritating?
Thank you very much! -
3 Replies
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2. The gold standard of safety information about fragrance ingredients is IFRA. https://ifrafragrance.org/safe-use/library
1. The truth is this research hasn’t been done. Dermatologists give the general advice that products should closely match the pH mantle but that is based more on a hunch than on specific evidence. And I’m certain no one has specifically investigated whether a product at pH = 4.0 is better/worse than a product at pH = 5.0. This is an interesting review of skin pH, the state of research and some recommendations.
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@Perry Thank you very much
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This https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6593431/ may be of interest in support of a more acidic pH for skincare
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