I want to make a caffeine eye serum by using Caffeine Anhydrous by Sigma-Aldrich. Catalog Number W222402
I already tried to dissolve in hot water like the formulation guide says, but it crystallized into fibrous-like substance if cooled down to room temperature. I tried to reheat it, but with no avail. It re-dissolved at hot temperature, but when it cooled down again to room temperature, it still recrystallized, and it even got worse. It looked like pulp now.
I tried to make 5% Caffeine Eye serum like the one by The Ordinary.
I used 75% distilled water, 7% propanediol, 2% glycerine, 5% caffeine, 5% Green Tea Extract in Propylene Glycol, 2% White Willow Extract, 2.5% Beta Glucan, 1% LMW Sodium Hyaluronate, 0.5% Ammonium Polyacryloyldimethyl Taurate, 0.1% Xanthan Gum, 0.5% Adenosine, 1% Oligopeptide, and 0.9% Phenoxyethanol and 0.1% EDTA 4Na.
Does anyone know how to dissolve the Caffeine properly and prevent it to recrystallized?