Glycine
Drops core body temperature and quiets the mind for faster sleep onset.
- Typical dose
- 3–5 g
- When to take
- Evening
- Onset
- Often felt the first night
What it does
Benefits
- Speeds sleep onset
- Improves subjective sleep quality
- Reduces daytime sleepiness the next day
- Supports collagen synthesis and joint tissue
The science
How it works
Glycine is an inhibitory neurotransmitter that signals the hypothalamus to lower core body temperature — a key cue for sleep. Also supports glutathione and collagen production.
Getting it right
Dose & timing
Dose guidance
3 g about 30 min before bed. Up to 5 g for heavier sleep disturbance. Well-tolerated long-term.
Best time to take
30 minutes before bedtime. Mixes easily into water — slightly sweet.
Is it for you?
Who should (and shouldn't) take it
Good for
- Racing mind at bedtime
- Shift workers resetting sleep
- People who wake unrefreshed
- Collagen and skin support
Skip or ask a doctor if
- You take clozapine (may reduce its effect)
- You have severe kidney disease
Know before you start
Side effects & safety
- Rare — mild stomach upset
- Very rare — morning drowsiness at high doses
Shopping guide
Forms & what to look for
- Pure powder
Cheapest and most flexible; mild sweet taste
- Capsule
Convenient but many capsules to reach 3 g
Combining
Stacks well with / avoid pairing
Stacks well with
Common questions
FAQ
How is glycine different from magnesium for sleep?
Magnesium calms the nervous system; glycine drops body temperature. They stack well.
Can I take it with collagen?
Yes — collagen is high in glycine, so think of it as overlapping benefit.
References
Sources & further reading
Educational only, not medical advice. Check with a clinician before starting anything new, especially if you're on medication or pregnant.