FULLfast is a natural appetite control spray containing 5-Hydroxytryptophan that has been clinically shown to help people feel fuller while dieting. It works by releasing serotonin in the brain to prevent eating and only requires 3 sprays taken 5 times per day. Studies found volunteers started feeling less hungry around the 5th day of use while following a weight loss program. FULLfast is easy to use without water and helps stick to exercise and diet plans.