Combining L-Ascorbic Acid and Rose Hip Oil in a Formulation

Yes, it is possible to include both Vitamin C (L-ascorbic acid) (Ultra-Fine) and Rose Hip Oil (Virgin, Fresh) or Rose Hip Oil (Extra Virgin) in the same cosmetic formulation.

However, it's important to understand their properties:

• Vitamin C (L-ascorbic acid) (Ultra-Fine) is a water-soluble ingredient.
• Rose Hip Oil is an oil-soluble ingredient.

Since they dissolve in different types of solvents (water vs. oil), they cannot be simply mixed together in a single phase like a pure water-based serum or a pure oil. To combine them, you would typically need to create an emulsion, such as a cream or lotion. An emulsion uses emulsifiers to blend a water phase (where L-Ascorbic Acid can be dissolved or dispersed) and an oil phase (where Rose Hip Oil is included).

Formulating with L-Ascorbic Acid requires careful attention to stability. It is prone to oxidation, especially in the presence of water. The product description for L-Ascorbic Acid (Ultra-Fine) notes its suitability for anhydrous (water-free) formulas and mentions that it should not be mixed directly with water due to oxidation. If formulating an emulsion, the L-Ascorbic Acid would typically be handled carefully in the water phase, and the final product's pH would need to be within the stable range for L-Ascorbic Acid (typically pH 2.0-4.0, with cosmetic products needing a pH of at least 3.5).

In summary, while you cannot simply mix them directly, they can be successfully incorporated into a single formulation like a cream or lotion using proper emulsification techniques, while also addressing the stability requirements of L-Ascorbic Acid.