Glycine is an amino acid. Not a hormone. Not a sedative. Something your body already produces and already knows how to use.
What it does is specific and documented.
It binds to receptors in the hypothalamus the part of the brain that controls body temperature and the sleep-wake cycle. It initiates vasodilation in the skin increasing blood flow to the surface of the body, pulling heat away from the core. Core temperature drops. The brain receives the thermoregulatory signal it was waiting for.
That is the first mechanism.
The second mechanism is equally important for the hyperaroused nervous system.
Glycine also acts as an inhibitory neurotransmitter throughout the brain. It directly quiets the neural firing that keeps the anxious mind running at midnight. The looping thoughts. The worst-case scenarios. The monitoring. The snap-back panic at the moment of drifting.
Not by sedating. Not by suppressing. By delivering the physiological message that the danger is over. That the night is safe. That the nervous system is allowed to stand down.
Clinical studies published in the Journal of Pharmacological Sciences show that 3 grams of Glycine taken before bed significantly improves sleep quality, shortens time to reach slow-wave deep sleep, and dramatically improves next-day alertness and cognitive function.
Not 200mg. Not 500mg. 3 grams. The dose that matches what the research actually used.
Most products contain a fraction of this. Buried in a proprietary blend. At a dose that cannot replicate what the research showed.