Ranked by evidence

Best supplements for sleep quality and insomnia

Sleep is the category with the widest gap between marketing and evidence: dozens of products, only a handful with trials worth reading. Everything below is ranked by how strong the evidence is for sleep specifically, not by how well it sells. Expect modest, real help with falling asleep or staying asleep — none of these behaves like a prescription sleeping pill.

Evidence last reviewed: August 2026

Top picks

Option	Evidence	Best for	The honest note
Melatonin	Moderate evidence	falling asleep faster and jet lag	Hormone that sets the circadian clock: shortens time to fall asleep and helps reset after jet lag. The effect is real but modest, not a knockout sedative.	View
Magnesium	Moderate evidence	older adults with insomnia, low intake	Moderate evidence for better sleep in older adults with insomnia. Matters most if your intake is low, which is common; it also lowers blood pressure.	View
L-Tryptophan	Moderate evidence	waking up during the night	Above 1 g before bed it measurably cuts time spent awake during the night. Depends on carbohydrate intake; worth knowing its contamination-outbreak history.	View

Solid options

Option	Evidence	Best for	The honest note
Milk Peptides (Lactium)	Moderate evidence	stress-related poor sleep	Casein peptide that binds GABA-A sites without dependence. Small, largely industry-linked trials show modest gains in sleep quality in poor sleepers.	View
Lavender Extract (Silexan)	Moderate evidence	sleep disturbed by anxiety	Silexan has the strongest trial record of any calming herb, with moderate evidence for anxiety-related sleep disturbance and no sedation or dependence.	View

Situational

Option	Evidence	Best for	The honest note
Ashwagandha	Moderate evidence	stress-driven sleeplessness	For nights wrecked by stress: moderate evidence for lower stress, anxiety and cortisol. No direct sleep claim here, and the trials are still small.	View
Soy Isoflavones	Moderate evidence	menopausal hot flashes at night	Menopause only: cuts hot flashes by roughly a fifth to a quarter over 8-12 weeks, far less than hormone therapy. Nothing here is a claim about sleep itself.	View

Popular for this goal — but the evidence says skip

Valerian Root Limited evidence
The most-studied herbal sleep aid, and it still has not clearly beaten placebo on objective measures; extracts differ wildly between products.
Glycine Limited evidence
Its sleep reputation rests on a few Japanese crossover studies of about a dozen people each, never independently replicated at scale.
L-Theanine Moderate evidence
Real but small effects on acute stress; the sleep evidence is weaker than the marketing suggests and mostly subjective.
Apigenin Limited evidence
A bestseller built on podcast attention and mouse studies: there is not one randomised trial of isolated apigenin for sleep in humans.
CBD (Cannabidiol) Limited evidence
Genuinely effective as a prescription anticonvulsant, but the sleep and anxiety evidence is thin and typical over-the-counter doses are low.
Sleep Formulas (Blends) Limited evidence
Most blends work because of the melatonin in them, at a dose you can buy alone for far less; the rest of the label is usually sub-therapeutic.

Our verdict

Melatonin for falling asleep faster and magnesium if your intake is low or you are an older adult with insomnia are the two most defensible buys. If the problem is waking during the night, tryptophan above 1 g is the next thing to try.