Preservative queries for a hair conditioner. (1) I am considering using Optiphen ND. Is anyone aware of issues with this preservative if the recipe includes Cetrimonium Chloride (cationic conditioner) and Hydrolyzed Soy Protein? I remember reading somewhere that these may inactivate the Optiphen ND. (2) As an alternative I am considering using Phenoxyethanol & Benzyl Alcohol. Any opinions/advice on these? (3) Another option is Potassium sorbate & Phenoxyethanol. Again, any opinions? Thanks
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