Hyaluronic Acid Supplement: Benefits, Dosage and Does It Work?
Do hyaluronic acid supplements work? Clinical trial results for skin hydration, the best dosage, side effects, and oral vs topical HA.
You’re exhausted, but your brain won’t switch off. Or you drop off fine and then wake at 3 a.m., wide awake. It’s no surprise that “what supplements can I take to help me sleep?” is one of the most searched health questions there is. The supplement aisle is full of options: melatonin, magnesium, valerian, glycine, L-theanine, ashwagandha. But which ones actually work, and for what kind of sleep problem?
This guide ranks the most popular sleep supplements by the strength of the evidence, matches them to specific sleep problems, and explains the habits that matter even more. It’s also honest about the limits: for long-term insomnia, supplements are a nudge, not a cure.
Different supplements help with different problems, so it’s worth being specific:
When to see a doctor: if poor sleep has lasted three months or more, affects your days, or comes with loud snoring, gasping or pauses in breathing, talk to a doctor. The American College of Physicians recommends CBT-I as the first treatment for chronic insomnia, ahead of any pill (Qaseem et al., 2016).
Melatonin is the hormone your brain releases in the evening to signal that it’s time to sleep. As a supplement, it works more like a timing signal than a sedative. A meta-analysis of 19 trials with 1,683 people found melatonin helped people fall asleep about 7 minutes faster, sleep about 8 minutes longer and rate their sleep quality higher, and the benefits didn’t fade with continued use (Ferracioli-Oda et al., 2013). Those are modest numbers, which is why melatonin works best for jet lag, shift work and a late body clock rather than chronic insomnia.
How to use it: more isn’t better. Doses of 0.5 to 3 mg taken 1 to 2 hours before bed are typical. Sustained-release forms may suit people who wake in the night. Be choosy about brands, because when researchers tested melatonin gummies sold in the US, most contained a very different amount from the label, from 74% to 347% of the stated dose (Cohen et al., 2023). Wondering about nightly use? Read should you take melatonin every night?
Magnesium calms the nervous system by supporting GABA, the brain’s main “slow down” chemical. A meta-analysis of trials in older adults with insomnia found magnesium helped people fall asleep about 17 minutes faster than placebo, although the authors rated the evidence as low quality (Mah & Pitre, 2021). In one of those trials, older adults taking magnesium for eight weeks also had better sleep efficiency, higher melatonin and lower cortisol levels (Abbasi et al., 2012).
Magnesium glycinate is a popular choice for sleep because it’s gentle on the stomach. Compare forms in magnesium glycinate vs threonate for sleep, and see why magnesium glycinate belongs in your sleep routine.
L-theanine, an amino acid from tea, promotes relaxation without sedation. In a four-week placebo-controlled trial, 200 mg a day improved sleep quality scores, including how long it took to fall asleep and how often sleep was disturbed (Hidese et al., 2019). It’s a good fit if a racing mind keeps you awake.
Glycine is an amino acid that helps lower core body temperature, one of the body’s natural signals for sleep. In human studies, 3 g before bed improved sleep quality, and in people whose sleep was cut short, it reduced next-day fatigue and sleepiness (Bannai et al., 2012). The studies are small, but glycine is inexpensive and well tolerated.
A meta-analysis of five randomized trials with 400 people found ashwagandha extract improved overall sleep, with bigger effects in people with insomnia, at doses of 600 mg a day or more, and after at least eight weeks (Cheah et al., 2021). It also improved anxiety and morning alertness. Learn more in ashwagandha for stress and sleep quality.
Valerian root has been used for sleep for centuries, often combined with hops, passionflower and lemon balm. A meta-analysis of 16 trials found people taking valerian were more likely to report better sleep quality, but most studies had significant flaws and there were signs of publication bias (Bent et al., 2006). Some people find herbal blends helpful for occasional restless nights, but the evidence is weaker than for the options above.
5-HTP is a precursor to serotonin and melatonin. Evidence for sleep is limited, and it shouldn’t be combined with antidepressants because of the risk of serotonin syndrome. Read more in 5-HTP for sleep quality.
For chronic insomnia, the American Academy of Sleep Medicine suggests doctors don’t use melatonin, valerian or the sleep aid diphenhydramine as treatments, because the benefits in insomnia trials were small (Sateia et al., 2017). That doesn’t mean they’re useless. It means they’re better suited to occasional sleeplessness, jet lag and body-clock problems than to long-term insomnia, where CBT-I works best.
| Supplement | Best for | Typical dose | Evidence |
|---|---|---|---|
| Melatonin | Falling asleep, jet lag, late body clock | 0.5–3 mg, 1–2 h before bed | Moderate (meta-analysis), modest effect |
| Magnesium | Falling asleep, tension, older adults | 200–400 mg in the evening | Low to moderate |
| L-theanine | Racing mind, sleep quality | 200 mg | Early (small RCT) |
| Glycine | Sleep quality, next-day alertness | 3 g before bed | Early (small studies) |
| Ashwagandha | Stress-related insomnia | 600 mg+/day for 8 weeks | Moderate (meta-analysis) |
| Valerian blends | Occasional restless nights | Varies | Weak and mixed |
| 5-HTP | — | Varies | Limited; drug interactions |
For the complete picture, read our ultimate guide to restorative sleep.
The Holitro Sleep Pack combines Magnesium Glycinate, L-Theanine (200 mg) and Ashwagandha (500 mg) in one evening tear-away pouch, designed to help you unwind and support restful, natural sleep.* It’s melatonin-free and valerian-free, so there’s no hormone and no herbal smell. Thirty pouches arrive each month.
Prefer a different combination? Build your own in the Custom Pack Builder. Taking medication, pregnant or breastfeeding? Please check with your doctor first. *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
The best-supported options are melatonin for falling asleep and body-clock issues, magnesium, L-theanine, glycine, and ashwagandha when stress is the main cause. Pick based on your specific sleep problem, and start with one at a time.
Melatonin has the most research, but its effect is modest: on average, people fall asleep about 7 minutes faster. For many people, consistent sleep habits and managing stress make a bigger difference than any single supplement.
Magnesium, glycine and L-theanine are the best-studied melatonin-free options. Ashwagandha is a good choice if stress and anxiety are keeping you awake.
Most are considered safe for short-term use, and melatonin’s benefits didn’t fade in longer trials. But if you need help sleeping most nights for more than a few weeks, talk to a doctor, since CBT-I and treating underlying causes work better long term.
Magnesium and glycine may help with sleep quality and staying asleep, and sustained-release melatonin is designed for night waking. Also look at common causes such as alcohol, a warm room and stress hormones. See how to fall back asleep after waking at 3 a.m.
Magnesium has the most direct evidence in older adults, and low-dose melatonin can help with an early-shifting body clock. Older adults should avoid sedating antihistamines and check with a doctor, especially if they take several medications.
The best supplements for sleep depend on why you’re not sleeping. Melatonin helps with timing, magnesium and glycine support deeper rest, L-theanine quiets a busy mind, and ashwagandha helps when stress is the culprit. Their effects are real but modest, so pair them with a steady wake-up time, morning light and a calm wind-down. If sleep has been a struggle for months, see a doctor about CBT-I, the most effective long-term fix.
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