Glycine
Inhibitory neurotransmitter and structural amino acid; 3 g before bed shows evidence for improving sleep quality and reducing daytime fatigue.
Stacks containing Glycine
Public community stacks that include this ingredient.
PMS Calmer (Low-Stim, Cycle-Friendly)
Cycle-phase support focused on calm and sleep quality without stimulants.
Sleep Stack (Ultra-Gentle)
Improves sleep quality without heavy sedation or melatonin.
Sleep & Recovery Stack
Designed to support sleep quality, parasympathetic activation, and overnight recovery without heavy sedation.
Sleep & Calm Wind-Down
Supports parasympathetic activation before sleep.
Stress-Resilient Training Stack
Supports training consistency under physical and mental stress.
Sleep Onset Support (Low Dose)
Supports sleep onset with minimal next-day grogginess.
3 g glycine before bed significantly reduced daytime sleepiness, fatigue, and cognitive impairment following 25% sleep restriction; mechanism involves core body temperature reduction via SCN NMDA receptors.
15 g gelatin (rich in glycine and proline, with vitamin C) before intermittent exercise doubled collagen synthesis markers (P1NP) vs. placebo; glycine is the most abundant amino acid in collagen (~33%).