Sleep & Anxiety Supplements
The short version: magnesium glycinate and low-dose melatonin have the most defensible evidence for sleep, neither produces addiction, and most other "natural" sleep aids are oversold.
For full detail on the evidence base, addiction/tolerance/dependence concerns, and dose recommendations for magnesium glycinate, L-theanine, melatonin, ashwagandha, glycine, valerian, CBD — see the dedicated Sleep supplements page in the Sleep section.
This page is the supplement-side cross-reference and quick summary.
Quick summary
| Supplement | Evidence | Safety | Addiction risk | Verdict |
|---|---|---|---|---|
| Magnesium glycinate (200–400 mg) | Moderate | Excellent | None | Worth trying |
| L-theanine (200 mg) | Weak–Moderate | Excellent | None | Worth trying |
| Melatonin (0.3–1 mg) | Moderate (narrow) | Good | None | Use case-specific |
| Ashwagandha (300–600 mg) | Moderate | Moderate (rare hepatotoxicity) | None | Selective use |
| Glycine (3 g) | Weak | Excellent | None | Optional |
| Valerian | Weak/mixed | Good | Low | Skip |
| CBD | Preliminary | Variable (drug interactions) | Low | Skip absent indication |
On the addiction question, specifically
None of the supplements above produces clinically significant addiction, tolerance, or withdrawal in the doses studied. This is a key advantage over prescription sleep medications:
- Benzodiazepines, Z-drugs, OTC antihistamines — all carry meaningful tolerance, dependence, and withdrawal risks.
- DORAs (suvorexant, lemborexant, daridorexant) — newer prescription class without dependence/tolerance/rebound, similar to natural supplements in this respect.
That said:
- "No addiction" doesn't mean "use forever without thinking." A psychological dependence ("I can't sleep without it") can develop with any sleep aid. The strongest sustainable approach is foundational sleep hygiene + CBT-I if needed, with supplements as occasional adjuncts.
- Long-term safety data (>1–2 years continuous daily use) is limited for most of these. Magnesium and melatonin have the longest track records.
What to combine, what to avoid
Reasonable combinations
- Magnesium glycinate + L-theanine (evening, 1–2 h before bed) — common stack, both safe, complementary mechanisms (Mg modulates NMDA/GABA, L-theanine modulates glutamate/alpha waves).
- Magnesium glycinate + low-dose melatonin for travel or shift transition — fine.
Be cautious with
- CBD + benzodiazepines / Z-drugs / SSRIs / statins / warfarin — CBD inhibits CYP3A4 and CYP2C9.
- Ashwagandha + thyroid medications, immunosuppressants, sedatives — can amplify effects.
- Multiple sedatives layered — even "natural" sedatives can have additive effects with each other and with alcohol.
Avoid layering with prescription sleep aids
If you're on a prescription sleep medication, talk with your prescriber before adding any of these supplements. Most are safe, but the conservative approach is to use one strategy at a time.
When supplements aren't enough
Persistent sleep problems (insomnia ≥3 nights/week for ≥3 months) call for:
- CBT-I as first-line — see Insomnia treatment.
- Screening for OSA if any risk factor — see Sleep breathing.
- Evaluation for underlying mood, pain, or medical conditions.
Supplements are adjuncts, not solutions, for chronic insomnia. The same is true of anxiety: ashwagandha has the cleanest short-term anxiety signal in the supplement space, but the autonomic-retraining levers (slow breathing, mindfulness, exercise, social connection) are far higher-leverage long-term. See Stress.