Preservative queries for a hair conditioner

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
Dr. Mike Thair
Cofounder & Chief Formulator
Indochine Natural
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