Full-spectrum protection from preservatives
I’m planning on using phenoxyethanol in a o/w face serum with potentially around 85% water content. I’m aware that phenoxyethanol is not enough on its own for full-spectrum protection as it is mainly active on gram-negative bacteria with possibly some activity on gram-positive bacteria. For full protection, should I add some phenylethyl alcohol (PEA) to combat the moulds/yeasts or is this redundant if I’m using phenoxyethanol? Can I use the following in a leave-on face serum to add to the aspects that phenoxyethanol alone does not cover against: iodopropynyl butylcarbamate, o-cymen-5-ol, hydroxyacetophenone, Tropolone, nasaplin, Calcium propionate?