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Is it necessary to use multiple surfactants?
I’m working on a face wash recipe and I have read that it is necessary to use multiple surfactants in order to increase mildness of a formula. I’m thinking of trying out Disodium Laureth Sulfosuccinate and I wasn’t sure if it it mild enough on its own or if mixing it with another surfactant would be better ( milder). One site I was checking out recommended using Cocoamidopropyl Betaine in every face wash to increase the mildness of the other surfactants. Is this necessary/helpful. Any recommendations.
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6 Replies
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Sounds reasonable to me. Betaine is a good choice
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Is it true that Betaine working at PHs below 5 releases nitrosamines?
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@ALGAR wow now that sounds interesting, though I hope it’s not the case.
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in a word, no
the only potential source of nitrosamines in betaine is cocamidopropyl dimethylamine (an impurity, present in trace amounts), and it only forms nitrosamines in presence of a nitrite source (e.g. bronopol)
betaines themselves can’t form nitrosamines at all, as they don’t have the right chemical functionality
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If I remember correctly, cocamidopropyl hydroxysultaine would also be a good amphoteric to work with the disodium laureth sulfosuccinate and it is Whole-Foods-acceptable, whereas they have weird and inconsistent opinions about coco betaine… if that matters to you.
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I’m still not clear on the issue about Betaines. Did some research and came across the above article. Don’t agree with everything it says either pro or con….butWhat do you think? What could be a valid alternative to Betaines if needed?
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