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Question about lipophilic preservatives and water phase
Hi, all.
As background, the natural preservative magnolia extract is insoluble in water, and so Cosphaderm recommends this ingredient be put into a glycol so that it enters (and protects) the water phase.
My question is: How is this not an issue for the many other preservatives that have poor water solubility and which are almost always added after emulsification? Do we trust that they are somehow able to enter the water phase? (I guess they must be, otherwise the formulas would not pass preservative efficacy testing, but I was curious about how this works.)
Thank you.
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1 Reply
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I’d not trust anything but your own data -includng that this chemical mixture is effective as preservative.
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