Glycine, the smallest amino acid in nature, interacts with NMDA receptors in the brain's sleep regulating center and may help support sleep onset. Human trials found that 3 grams of glycine before bedtime Glutathione is such a critical soldier in our line of defense that our bodies make it themselves. We even have mechanisms that recycle and reuse it. But what happens when our toxic Amazon.com: LILICARE Kids Sleep Gummies & Sulforaphane with Glutathione Gummies : Health & Household 7 Glycine Benefits: Sleep & Metabolism Secrets