Hydrochloric acid upper safe limit for rinse off product?
What is the maximum safe use level for hydrochloric acid in shampoo and body wash?
I currently have shortage of citric acid and local suppliers doesn’t have it.
I am currently making shampoo with SLS powder and it needs 5% citric acid to adjust the pH to 5.
I did use salicylic acid and it needed 10% salicylic acid to adjust the pH 😃 so not a practical replacement.
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