Picking a sleep supplement is confusing because most products blur together. This is an editor’s shortlist, organized by the problem you are trying to solve — not a lab test, and not medical advice. Three ingredients have the most reasonable evidence behind them, and each suits a different situation.
Quick comparison
| Ingredient | Best for | Typical evening dose | What to look for |
|---|---|---|---|
| Magnesium glycinate | Winding down, muscle tension | 200–400 mg elemental | Chelated glycinate; third-party tested |
| Melatonin | Jet lag, shifted schedule | 0.5–3 mg | Low dose; USP verified |
| L-theanine | A racing mind at bedtime | 100–200 mg | Suntheanine® form |
Our picks
Magnesium Glycinate (e.g. NOW, Doctor's Best)
- Chelated glycinate — well absorbed and gentle on digestion
- Look for third-party testing (NSF, USP or BSCG)
- 200–400 mg elemental magnesium in the evening
Budget-friendly · widely available
Check Price →Melatonin, low dose (e.g. Nature Made, Natrol)
- Start low: 0.5–3 mg, about 30–60 minutes before bed
- Best for a shifted schedule, not a nightly sedative
- Choose a USP-verified product where possible
Inexpensive · easy to find
Check Price →L-Theanine (look for Suntheanine®)
- An amino acid that supports calm without heavy sedation
- Commonly used at 100–200 mg in the evening
- Works best alongside a consistent wind-down routine
Vegan-friendly
Check Price →How to choose
Start simple and change one thing at a time. If you mainly struggle to relax, magnesium is a reasonable first try. If your problem is timing — travel or shift work — melatonin is better suited. If your body is tired but your mind will not switch off, L-theanine is worth a look. Combination “sleep complex” formulas can be convenient, but stacking ingredients is not automatically more effective, and it makes it harder to tell what is actually helping.
For neutral background on how these work, the U.S. National Institutes of Health publishes plain-language overviews of magnesium and melatonin. Where the evidence is still thin, we say so rather than overselling.