Suitability of Cooking Oils and Role of Vitamin E in Cosmetic Formulations (Lotion, Lip Balm)
Question
I have two questions regarding cosmetic formulations, specifically lotions and lip balms:
- Can cooking oils purchased from the supermarket be used in cosmetic formulations like lotion and lip balm? If not, why?
- What is the role of Vitamin E (
Tocopherol) in these oil-based formulations, particularly concerning the prevention of rancidity? What percentage is typically used for its antioxidant function versus its skin conditioning benefits?
Answer
Subject: Oils in Lotion and Lip Balm
Hello,
Regarding your questions about using cooking oils in lotion or lip balm and the use of Vitamin E:
Using cooking oils from the supermarket: As mentioned in the previous reply, cooking oils are generally not recommended for cosmetic formulations like lotions and lip balms. This is because they are refined for consumption, a process that may leave certain compounds that can lead to faster oxidation (rancidity) and spoilage when applied to the skin compared to cosmetic-grade oils. Cosmetic-grade oils undergo different processing to ensure higher purity, stability, and suitability for skin application. While you could technically use them, they may reduce the shelf life and stability of your product and might have stronger odors or colors. For best results and product longevity, it is advisable to use oils specifically processed for cosmetic use.
Vitamin E (Tocopherol) and rancidity: Yes, you are correct. Vitamin E (specifically Tocopherol) is commonly added to oil-based formulations like lotions and lip balms primarily as an antioxidant. Its main function in this context is to help prevent the oils from oxidizing and going rancid, thereby extending the shelf life of the product. It also offers skin benefits, but its role in preventing rancidity is crucial for the stability of the oils.
For its function as an antioxidant to prevent rancidity, Vitamin E is typically used at low concentrations, often ranging from 0.05% to 1% of the total formulation. Using higher percentages (e.g., 5-20%) is usually for leveraging its skin conditioning properties, but a small amount is sufficient for antioxidant protection against rancidity.
I hope this clarifies your questions!