Anhydrous Vitamin C Serum

Based on the staff's response, it is possible to create an anhydrous (water-free) Vitamin C serum similar to Kiehl's. The staff is currently developing a base for this purpose, which will be mixed with Vitamin C powder by the user just before use to ensure maximum freshness and efficacy.

The proposed formula structure for this anhydrous base is:

• Propylene Glycol: 40%
• Silicone Gel Base (Dimethicone (and) Dimethicone/Vinyl Dimethicone Crosspolymer): 40%
• Glycerin: 5%
• Vitamin C Ultra-Fine (L-Ascorbic Acid): 10-15% (This is added by the user)
• Optional: Vitamin E (Tocopheryl Acetate): 1% (for added skin nourishment)
• Optional: Bisabolol: 0.5% (to reduce irritation)

Key points about this type of serum:

• Anhydrous: Being water-free helps prevent Vitamin C oxidation, keeping it stable.
• No Preservatives: Since bacteria require water to grow, an anhydrous formula does not need preservatives.
• Mixing: The Silicone Gel Base helps suspend the Vitamin C powder evenly throughout the serum, preventing it from settling at the bottom. No heat is required for mixing.
• Concentration: The proposed formula suggests adding 10-15% Vitamin C. Achieving 20% might require adjusting the percentages of other base ingredients, though the staff's current development focuses on the 10-15% range for their base.
• Warming Sensation: The slight warming or tingling feeling upon application is normal and likely due to the high concentration of Vitamin C.
• Mixing Service: The staff is not currently offering a mixing service but plans to sell the base for self-mixing in the future.