Best Supplements for Sleep (2026)
Evidence-backed supplements recommended by longevity experts to improve sleep quality, reduce sleep latency, and support deep restorative rest.
Ranked by expert consensus across 86+ longevity protocols. Last updated March 2026.
Top 8 Supplements for Sleep
Magnesium (Threonate/Glycinate)
Highly bioavailable magnesium in threonate or glycinate form for superior absorption. Supports deep sleep quality, cognitive function, and nervous system relaxation. Magnesium threonate is particularly valued for its ability to cross the blood-brain barrier.
Recommended by 86 experts
Magnesium (Threonate/Glycinate)
supplements
Ashwagandha (KSM-66)
KSM-66 ashwagandha root extract, the most clinically studied form of this traditional adaptogenic herb. Supports healthy cortisol levels, reduces perceived stress, and may improve sleep quality and exercise recovery. Widely used in longevity protocols for its effects on hormonal balance and resilience to chronic stress.
Ashwagandha (KSM-66)
supplements
Melatonin (Low Dose)
Low-dose melatonin supplement to support natural circadian rhythm and sleep onset. Research suggests doses of 0.3-1 mg are often more effective than higher amounts for improving sleep quality. Also studied for its antioxidant properties and potential anti-aging benefits.
Recommended by 7 experts
Melatonin (Low Dose)
supplements
L-Theanine
An amino acid found naturally in green tea that promotes calm focus without drowsiness. L-theanine increases alpha brain wave activity, supporting relaxation and stress reduction. Often combined with magnesium and melatonin for improved sleep quality, or paired with caffeine for smooth, jitter-free mental clarity.
Recommended by 5 experts
L-Theanine
supplements
Reishi Mushroom Extract (Ganoderma lucidum)
Dual-extracted Ganoderma lucidum mushroom, known as lingzhi in Chinese medicine and the 'mushroom of immortality' for its 2,000-year history in TCM longevity practice. Reishi's bioactive triterpenes and beta-glucans have been studied for immune modulation, stress adaptation, sleep quality improvement, and anti-tumor properties. Modern clinical evidence supports its use for calming the nervous system, enhancing natural killer cell activity, and supporting liver health.
Recommended by 5 experts
Reishi Mushroom Extract (Ganoderma lucidum)
supplements
Glycine
Glycine is the simplest amino acid and a key building block for collagen, glutathione, and creatine. Supplementing with glycine supports sleep quality, joint health, and detoxification. Research suggests 3-5 grams before bed can improve sleep onset and next-day cognitive performance.
Recommended by 4 experts
Glycine
supplements
Inositol (Myo-Inositol)
Inositol is a carbocyclic sugar involved in insulin signaling, neurotransmitter function, and lipid metabolism. Myo-inositol supplementation has shown benefits for insulin sensitivity, hormonal balance, anxiety reduction, and sleep quality. It is particularly well-studied for metabolic syndrome and PCOS support.
Recommended by 3 experts
Inositol (Myo-Inositol)
supplements
Taurine
Taurine is a conditionally essential amino acid concentrated in the brain, heart, and muscles. A landmark 2023 study in Science found that taurine levels decline with age and that supplementation extended lifespan in animal models. It supports cardiovascular function, mitochondrial health, and exercise performance.
Recommended by 1 expert
Taurine
supplements
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Frequently Asked Questions
What is the best supplement for sleep?
Magnesium (threonate or glycinate) is the most widely recommended sleep supplement among longevity experts. It supports nervous system relaxation and deep sleep quality. Many experts pair it with glycine or low-dose melatonin for enhanced results.
Is melatonin safe to take every night?
Research suggests low-dose melatonin (0.3-1 mg) is safe for most adults when used short-term. Many longevity experts prefer magnesium and glycine for long-term nightly use, reserving melatonin for jet lag or occasional sleep disruptions.
When should I take sleep supplements?
Most sleep supplements work best taken 30-60 minutes before bed. Magnesium glycinate and glycine can be taken with dinner or before bed. Melatonin should be taken 30 minutes before your target sleep time.
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