Preservative Use in Anhydrous Oil-Based Formulation

Regarding your question about using Phenoxyethanol SA (Optiphen Plus) with Grape Seed Oil, Wheat Germ Oil, Isododecane, and Argan Oil:

Phenoxyethanol SA (Optiphen Plus) is a preservative that is typically used in formulations containing water, as it needs to be dissolved in the water phase to be effective.

However, as the staff's reply indicates, if your formulation consists only of the oils you listed (Grape Seed Oil, Wheat Germ Oil, Argan Oil) and Isododecane, with no water added, then a preservative is generally not necessary. Microorganisms require water to grow and thrive, so a purely oil-based system is not conducive to microbial growth.

Therefore, in a water-free formulation containing only these oils and Isododecane, you would not need to add Optiphen Plus. Consequently, the questions about dissolving Optiphen Plus or needing an emulsifier to incorporate it become irrelevant in this specific context.