Serotonin syndrome can be fatal due an overload of serotonin in the body’s central nervous system which results in tremors, seizures, increased hypertension (may result in stroke or dead) and temperature of the body. Tryptophan functions as a biochemical precursor for serotonin. It is important you monitor foods high in tryptophan. Tryptophan is an essential amino acid is mainly the constituent of most protein-based foods or dietary proteins. It is plentiful in chocolate, oats, dried dates, milk, yogurt, cottage cheese, red meat, eggs, fish, poultry, sesame, chickpeas, sunflower seeds, spirulina, pumpkin seeds, and peanuts. You can have the foods above but in moderate amounts daily. The protein supplement shake has high amounts of protein and should not be used. If you are using it to gain weight, suggest eating more carbohydrates and moderate fat intakes for additional calories.