Insomnia: The Evidence-Based Supplement Protocol

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Chronic insomnia is best treated with cognitive behavioral therapy for insomnia (CBT-I), which has larger and longer-lasting effects than any pharmacotherapy or supplement. CBT-I is the standard first-line. Among supplements, a small set has credible RCT evidence — though most "sleep formulas" combine many ingredients at subclinical doses with poor head-to-head data.

Melatonin — Low Dose (0.1–0.5 mg), Timed Correctly

Melatonin's strongest evidence is for circadian-rhythm-disorder treatment (delayed sleep phase, jet lag, shift work) rather than chronic insomnia. Effective doses are far lower than commercial products provide. 0.1–0.5 mg taken 4–6 hours before desired sleep onset shifts circadian phase more effectively than 5+ mg taken at bedtime. See our melatonin dosing piece.

Magnesium Glycinate, 200–400 mg Elemental Nightly

Multiple small RCTs in adults with insomnia have shown magnesium supplementation improves subjective sleep quality, sleep efficiency, and serum melatonin. Effect modest. Take with the evening meal; glycinate form preferred. See magnesium glycinate piece.

Glycine, 3 g 1 Hour Before Bed

Glycine at 3 g taken before bed reduces sleep onset latency and improves subjective sleep quality in healthy adults with mild insomnia. The mechanism involves NMDA receptor activity and core body temperature reduction. Cheap, well-tolerated, surprising trial signal. See our glycine piece.

L-Theanine, 200 mg Before Bed

L-theanine does not produce direct sedation but reduces sleep-onset anxiety in adults with insomnia related to worry/rumination. Useful adjunct to magnesium and CBT-I.

Tart Cherry Concentrate or Whole Tart Cherry, 30 mL or 240 g Daily

Tart cherries contain endogenous melatonin and tryptophan. The 2017 RCT in adults with insomnia showed tart cherry juice increased sleep time by ~85 minutes and improved sleep efficiency versus placebo. See our tart cherry sleep piece.

What NOT to Take

Avoid Z-drugs (zolpidem, eszopiclone) without sleep medicine input — tolerance and complex sleep behaviors. Avoid benzodiazepines for chronic insomnia. Skip "sleep formula" megaproducts with 10+ ingredients at subclinical doses. Avoid high-dose valerian — most trials are null and supply is heterogeneous. Avoid kava — hepatotoxicity. Don't combine multiple sedating supplements (melatonin + valerian + magnesium + L-theanine + glycine) — attribution and overlap are impossible to interpret.

How to Run the Protocol

Sleep hygiene + CBT-I first — they have the largest evidence. Layer magnesium glycinate 300 mg + glycine 3 g + L-theanine 200 mg one hour before desired sleep onset. Use low-dose (0.3 mg) melatonin only for circadian timing problems (jet lag, DSPS). Re-evaluate sleep diary at 4 weeks. If unresolved, sleep medicine consultation for polysomnography and assessment of sleep apnea. See the evidence-based sleep stack.