Does this cationic emulsion need another anti fungal preservative?
This is a lotion formula for dry skin.
10 People who have used it like it very much and couldn’t tell any difference in mildness or irritation on skin with same formula preserved with 0.5% phenoxyethanol+ 0.15% caprylhydroxamic acid instead of formalin. Changing preservative system to 0.1% formalin is a big cost saving for me.
My question is about preservation spectrum of formalin at this pH.
Do i need an anti fungal preservative with 0.1% formalin in this cationic emulsion at pH 4.5 or not?
Behentrimonium chloride 0.5% active
Cetearyl alcohol 1%
Lactic acid 0.4% active
Formalin 0.1%(370ppm formaldehyde)