Hi there! I need some help with some preservatives I’m using. Wondering if it’s enough to use as a broad spectrum system. Working with a 4.5-5.5 PH in a hydrous solution for a scalp/hair treatment (about 10oz/300ML). Using Phytocide Aspen Bark Powder at 2.5%, Potassium Sorbate and Sodium Benzoate. Will this be enough to provide full preservation? Wondering if to add Benzyl Alcohol for that extra push. However, I wouldn’t want it to be too drying on the hair shaft.
Also using Cetearyl Alcohol as an emollient to break down/mix in my added oils.
Would love some good and positive feedback! Thanks in advance.
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