Best Magnesium for Sleep: Glycinate vs Threonate vs Citrate
Not all magnesium forms are equal for sleep. Here’s which to use.
For more sleep optimization, see: Best Sleep Supplements.
Quick Comparison
| Form | Best For | Price |
|---|---|---|
| Glycinate | Sleep + relaxation | $$ |
| Threonate | Brain/cognitive + sleep | $$$ |
| Citrate | General deficiency | $ |
| Oxide | Avoid (poor absorption) | $ |
Magnesium Glycinate (Best for Sleep)
Magnesium bound to glycine. The glycine itself is calming.
- Absorption: Excellent
- Sleep benefit: High (glycine is relaxing)
- Side effects: Low (no GI issues)
- Typical dose: 200-400mg elemental Mg
Pros
- Best absorbed
- Glycine adds calming effect
- No laxative effect
- Good research for sleep
Cons
- More expensive than citrate
- Large pills (to get effective dose)
Magnesium Threonate
Patented form (Magtein) that crosses blood-brain barrier.
- Absorption: Excellent
- Brain benefits: Unique (crosses BBB)
- Sleep benefit: Good
- Price: Most expensive
Pros
- Enters brain directly
- May improve memory/cognition
- Good for sleep
Cons
- Expensive
- Lower elemental magnesium per dose
- Need multiple pills daily
Magnesium Citrate
Well-absorbed, affordable, but can cause loose stools.
- Absorption: Good
- Sleep benefit: Moderate
- Side effects: Laxative effect possible
- Best for: General deficiency, regularity
Avoid Magnesium Oxide
The most common (and cheapest) form has only ~4% absorption. Essentially waste of money.
Sleep Protocol
| Priority | Recommendation |
|---|---|
| Best for sleep | Magnesium Glycinate 200-400mg |
| Sleep + cognition | Magnesium Threonate (Magtein) |
| Budget | Magnesium Citrate 200-400mg |
| Timing | 30-60 minutes before bed |
Best Products
Glycinate
- NOW Foods Magnesium Glycinate: $15-20
- Doctor’s Best High Absorption: $15-20
- Pure Encapsulations: $25-30 (premium)
Threonate
- Life Extension Neuro-Mag: $30-40
- Double Wood Magtein: $25-30
Stacking for Sleep
Effective sleep stack:
- Magnesium Glycinate 300mg
- + Glycine 3g (optional, adds to glycinate effect)
- + L-Theanine 200mg (optional)
Verdict
For sleep: Magnesium Glycinate is the clear winner. Well-absorbed, calming, no side effects.
For brain health + sleep: Add or substitute Magnesium Threonate.
Avoid: Magnesium Oxide (poor absorption).
For more sleep optimization, see: Best Sleep Supplements.