Thickeners and stabilizers such as gums and fatty alcohols. Use the right amount of shear recommended for the specific emulsifier you are using. If there are any elctrolytes (aloe vera, sodium lactate, sodium PCA) in your formula, make sure the emulsifier can handle them. Similarly, make sure the ingredients are compatibel with each other. For example, don't use anionic gums for cationic emulsions etc
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