When using ferulic acid, I make a slurry with glycerin and water and dissolve it at a very high temperature (>80 C).
After it dissolves, if it cools down a bit, it immediately starts to 'reappear' again, all flaky.
Should I add propylene glycol for example, and where in the process?
0,5% ferulic acid
50% of total % demi water
Dissolve at >80C.
in the rest of the water. Add to phase 1 = phase 3.
Add 1% hyaluronic acid (high molecular weight) to the mixture.Mix and let hydrate for a few hours.
Add 0,5 tocopherol to 3% polysorbate 80.
Add to phase 3.
Add 0,7% Cosgard (benzyl alcohol and dehydroacetic acid)
Where in this process should I add something like propylene glycol to avoid this problem, or is there another way (without the use of alcohol).
I had hoped it would remain dissolved in the glycerin, but I didn't think this one through enough.
* Another question: doesn't the high temperature affect the ferulic acid in a bad way? I know tocopherol is sensitive to heat and panthenol racemizes above 70C, but what about the other ingredients?