Use a broad-spectrum preservative if you will not be using all of your product within 1 day or if you won’t be refrigerating it. It’s always a good idea to use a broad-spectrum preservative anyway. But it’s an absolute necessity if you will be giving away or selling products.
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Tips
Use SUPERFATTING ingredients in surfactant recipes (shampoo). One easy to access superfatting ingredient is glyceryl oleate. Depending on the percentage, it helps keeps the hair from feeling stripped after rinsing.