Please help me choose a good and mild preservative blend for shampoo.
Which one is the mildest formaldehyde releaser and which one is the most effective for bacteria?
How is that compared to phenoxyethanol in effectiveness and mildness?
I will combine it with a fungicide. Options are caprylhydroxamic acid, Piroctone Olamine, sodium dehydroacetate, sodium benzoate. Which one do you recommend?
Any other suggested preservative blend?
This is the shampoo formula in Active ingredients:
Glycol distearate %2