The diet that raises maximally raises your needs for glycine doesn't provide it so collagen supplements come from this being able to provide a lot of glycine or one third glycine. Three grams of glycine before bed helps both falling asleep and the quality of the sleep during sleep by lowering core body temperature. Taking 15 grams of gelatin with 50 milligrams of vitamin c 30 minutes before you work out has been shown to increase blood flow and joint fluid movement. In schizophrenics 60 grams of glycina per day have been used to have antipsychotic effects.