Skin Whitening Oil Formulation with Perfect-C

Regarding your question about making a skin whitening oil by mixing Perfect-C with fractionated coconut oil and olive oil, and whether a preservative is needed:

As the staff correctly advised, since your formulation consists only of oils (Perfect-C, fractionated coconut oil, and olive oil) and contains no water, you do not need to add a preservative. Microorganisms require water to grow, so an anhydrous (water-free) oil mixture is not susceptible to microbial contamination.

Perfect-C (Ascorbyl Tetraisopalmitate) is an oil-soluble form of Vitamin C that is suitable for use in oil-based formulations like the one you described. It is known for its stability and effectiveness in skin whitening.

To maintain the stability and efficacy of Perfect-C, it is crucial to protect the finished product from light. Therefore, it is highly recommended to store the oil mixture in an opaque bottle.

For optimal long-term storage, keeping the product in the refrigerator (around 5°C) is also beneficial, in addition to avoiding light.

The recommended usage rate for Perfect-C in formulations for skin whitening is typically between 1% and 10%, with 5% being a commonly recommended concentration for good efficacy.