Glycine vs Valerian (Valeriana officinalis)
Both are used for sleep better. Here's how they compare on human evidence, mechanism, safety and availability — in plain English.
| Glycine | Valerian (Valeriana officinalis) | |
|---|---|---|
| Human evidence | ★★★☆☆ | ★★☆☆☆ |
| Legal status | OTC Supplement | OTC Supplement |
| How it works | Smallest amino acid; inhibitory neurotransmitter at spinal/brainstem glycine receptors (GLRA1), lowers core body temperature (a sleep-onset trigger) via peripheral vasodilation, and supplies one-third of collagen's amino acids. Mimics some… | The active valerenic acid is an allosteric modulator of GABA-A receptors, selective for β2/β3 subunits — nudging the brain's main inhibitory (calming) system, loosely the same target family benzodiazepines act on (far weaker). |
| In plain English | An amino acid that gently cools you down and quiets the nervous system for sleep, and is the main brick in collagen. Dirt cheap, very safe. | A traditional sleep herb that gently boosts GABA, the brain's "calm down" signal. The mechanism is real, but the sleep benefit in studies is modest and inconsistent. |
| Bottom line | One of the most undervalued supplements — sleep + connective tissue + longevity. | Low-risk and non-habit-forming, but expect a mild effect at best — not a reliable sleep fix. |
| Availability | Available over the counter | Available over the counter |
Which is better for sleep better?
We do not publish an indication-specific evidence grade for Glycine or Valerian (Valeriana officinalis) for sleep better, so we are not going to name a winner. The star ratings shown below are whole-compound summaries across everything each has been studied for — they are not a grade for this use, and comparing them here would be misleading. What actually differs is mechanism, side-effect profile, interactions, availability and cost. Those are compared in full below.
Full breakdowns: Glycine · Valerian (Valeriana officinalis).
Common questions
Is Glycine or Valerian (Valeriana officinalis) better for sleep better?
We do not publish an indication-specific evidence grade for Glycine or Valerian (Valeriana officinalis) for sleep better, so we are not going to name a winner. The star ratings shown below are whole-compound summaries across everything each has been studied for — they are not a grade for this use, and comparing them here would be misleading. What actually differs is mechanism, side-effect profile, interactions, availability and cost. Those are compared in full below.
What's the difference between Glycine and Valerian (Valeriana officinalis)?
Glycine: One of the most undervalued supplements — sleep + connective tissue + longevity. — Valerian (Valeriana officinalis): Low-risk and non-habit-forming, but expect a mild effect at best — not a reliable sleep fix.