We are looking for a good cooking method for a gel, which contains per 50 g: caffeine 3g Fluib. Fucus 3g Extract

As a base I would use an alcoholic carbomeergel. For the concentration of alcohol I would take 30%. Add caffeine in small quantities and see what quantity does not dissolve. Replace the undissolved quantity with the Cafeine-nabenzate complex described in OJ V.