How to maximize Retinol stability in emulsions - Ideas and questions
Other than optimal storage conditions (fridge, opaque pump bottle minimizing air exposure). What are best practices for formulating with Retinol?
High viscosity - less interaction between retinol and water molecules over time.
High oil % - Studies show that 40% oil emulsions can increase stability 2x over a 15% oil emulsion.
Consider a 100% oil formula, use waxes to make a "salve"?
Encapsulation through sonication with e.g. silica, make OWO formula (can be technically difficult, requires the right tools and materials).
Antioxidants: Vitamin E, Vitamin C, BHT, BHA typically used.
pH? What's the optimal number.
Anyone know what solvents or oils are best to improve Retinol stability? (theoretically, from studies or from experience) and what to avoid other than e.g. oxygen releasing agents and strong acids.
I've been thinking about making an anhydrous retinol serum, but I haven't seen any product of this type in the market and wonder why? Is it just because of the greasy feel? Or maybe there is another reason.
There is a company that offers retinol in cyclodextrin that is supposed to be stable
Anydrous would seem to make sense, possibly silicon based too? Seen any stability data? I remember seeing can remain stable in food oils for a long time at RT, but retinol is less stable.
check this one out - it's a silicone based retinol serum
Computer Sciences degree with little formulation experience - for personal use only
In fact retinol comes dissolved in corn oil or fractionated coconut oil, among other oils, so it must be stable. I was thinking about silicone too. I tried silicone with other actives and I'm happy with the results. Thank you simona for the link. This proves there is a silicone-based retinol product in the market.
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