Best Sleep Supplements: What Actually Works
Most sleep supplements are ineffective or poorly dosed. Here’s what has evidence.
To measure if your supplements are working, see: Best Smart Rings for
Sleep.
Supplement Tier List
| Supplement | Evidence | Dose |
|---|---|---|
| Magnesium Glycinate | Strong | 200-400mg |
| L-Theanine | Strong | 200-400mg |
| Glycine | Moderate | 3g |
| Apigenin | Moderate | 50mg |
| Melatonin | Moderate (low dose) | 0.3-0.5mg |
| Valerian | Weak | Variable |
Tier 1: Magnesium Glycinate
The most reliable sleep supplement:
- Well-absorbed form of magnesium
- Glycine itself is calming
- Most people are magnesium deficient
- No grogginess next day
Dose: 200-400mg elemental magnesium, 30-60 min before bed.
Tier 1: L-Theanine
Promotes relaxation without sedation:
- Increases alpha brain waves
- Reduces anxiety
- No dependency or tolerance
Dose: 200-400mg before bed.
Tier 2: Glycine
Amino acid that improves sleep quality:
- Lowers core body temperature (promotes sleep)
- May improve subjective sleep quality
- Can add to magnesium glycinate stack
Dose: 3g before bed.
Tier 2: Apigenin
Flavonoid from chamomile with calming effects:
- Binds to GABA receptors (mild)
- Popular in biohacker circles
- Less research than magnesium/theanine
Dose: 50mg before bed.
Melatonin: The Truth
Melatonin is misused:
- Effective dose: 0.3-0.5mg (not 3-10mg)
- Best for: Jet lag, shifting sleep schedule
- Not for: Nightly use or “more is better”
High-dose melatonin (5-10mg) can cause grogginess and may desensitize receptors.
Sleep Stack Protocol
Recommended combination:
- Magnesium Glycinate 300-400mg
- L-Theanine 200mg
- Glycine 3g (optional)
Take 30-60 minutes before bed.
What to Avoid
- High-dose melatonin: 0.5mg is enough
- Diphenhydramine (ZzzQuil): Anticholinergic, poor sleep quality
- Alcohol: Disrupts REM sleep
- Most “sleep gummies”: Underdosed nonsense
Best Products
| Supplement | Product | Price (~) |
|---|---|---|
| Magnesium Glycinate | NOW Foods, Doctor’s Best | $15-20 |
| L-Theanine | NOW Foods, Nootropics Depot | $12-15 |
| Glycine | NOW Foods, BulkSupplements | $15 |
| Apigenin | Swanson, Nootropics Depot | $10-15 |
Verdict
Start with: Magnesium Glycinate + L-Theanine.
Add if needed: Glycine or Apigenin.
Melatonin: Only low-dose (0.3-0.5mg), only for schedule shifts.
For all supplement guides, see: Best Greens Powder.