Dietary Supplements and Sleep: What to Know Before Trying Them

Difficulty falling asleep can happen for many reasons, including stress, schedule changes, environmental disruptions, medications, and underlying sleep or health conditions. An occasional restless night is different from an ongoing sleep problem that interferes with daily life.

Some people consider dietary supplements when changes to their sleep routine have not helped. However, “natural” does not automatically mean safe or effective. Evidence supporting many supplements marketed for sleep is limited or inconsistent, and individual responses can vary.

Editor’s note: This article is for general educational purposes and is not medical advice. Dietary supplements should not be used to diagnose, treat, cure, or prevent insomnia or another health condition. Consult a qualified healthcare professional before using a supplement, especially if you take medication, have a medical condition, are pregnant or breastfeeding, or are considering a supplement for a child.

Start With the Cause of the Sleep Problem

Before selecting a supplement, consider what may be affecting your sleep. Keeping a consistent schedule, limiting caffeine and alcohol near bedtime, reducing bright light and screen use in the evening, and maintaining a cool, quiet bedroom may help support healthy sleep habits.

For persistent insomnia, cognitive behavioral therapy for insomnia, or CBT-I, is usually recommended as the first treatment option. It addresses the thoughts and behaviors that can interfere with sleep rather than relying on a supplement or medication. Learn more from the National Heart, Lung, and Blood Institute.

Speak with a healthcare professional if sleep difficulties continue, affect daytime functioning, or occur alongside loud snoring, gasping during sleep, breathing pauses, or significant daytime sleepiness. These symptoms can require medical evaluation.

Dietary Supplements Are Not Approved Like Medications

In the United States, the Food and Drug Administration does not approve dietary supplements for safety and effectiveness before they are sold. Supplements may also interact with medications, affect laboratory tests, or create additional risks during surgery.

The FDA recommends discussing a supplement with a doctor, pharmacist, nurse, or registered dietitian before taking it. Review the FDA’s dietary supplement guidance.

What the Evidence Says About Common Sleep Supplements

Melatonin

Melatonin is a hormone involved in regulating the body’s sleep-wake cycle. Supplemental melatonin has been studied for concerns such as jet lag, shift work, and difficulty falling asleep, but the results depend on the situation.

Research suggests melatonin may modestly affect how quickly some people fall asleep, but it has not been established as a reliable treatment for chronic insomnia. Short-term use appears relatively safe for many adults, while its long-term safety remains uncertain.

Possible side effects include sleepiness, headache, dizziness, and nausea. Melatonin may interact with medications, including blood thinners, and extra caution is appropriate for children, older adults, pregnant or breastfeeding people, and people with certain medical conditions. Read the NCCIH melatonin overview.

Valerian Root

Valerian is an herb commonly included in products marketed for relaxation or sleep. Studies examining valerian for insomnia have produced inconsistent results, and its usefulness for insomnia has not been demonstrated.

Although reported side effects are often mild, the safety of long-term use is uncertain. Valerian should not be combined with alcohol, sedatives, or other products that cause drowsiness without professional guidance.

Magnesium

Magnesium is an essential mineral involved in many normal functions of the body. Research on magnesium supplements for insomnia remains limited, and existing studies have not provided enough high-quality evidence to determine whether magnesium reliably improves sleep.

Supplemental magnesium can cause diarrhea, nausea, and abdominal cramping. Excessive amounts can be dangerous, particularly for people with impaired kidney function, and magnesium can interfere with certain antibiotics and other medications. A healthcare professional can help determine whether testing or supplementation is appropriate. See the NIH magnesium fact sheet.

Cannabidiol, or CBD

CBD is frequently marketed for relaxation and sleep, but current evidence does not establish it as a treatment for insomnia or other sleep disorders. A review discussed by the National Center for Complementary and Integrative Health found insufficient evidence to support cannabinoid therapies for treating sleep disorders.

CBD can cause changes in alertness, mood, appetite, and digestion. It may also interact with medications and has been associated with liver injury. Product composition and THC content can vary, so hemp-derived does not necessarily mean risk-free or free of psychoactive contaminants. Review the NCCIH guidance on sleep supplements and CBD.

Kava

Kava is sometimes promoted for relaxation, but very little research has examined whether it helps with insomnia. More importantly, kava products have been associated with rare but sometimes severe liver injury.

Because of these safety concerns and the limited evidence for sleep-related benefits, kava should not be presented as a routine sleep aid. Anyone considering it should first speak with a qualified healthcare professional. Read the NCCIH kava safety information.

GABA and L-Theanine

GABA and L-theanine are also found in products marketed for relaxation and sleep. Although researchers have explored how these substances may affect the nervous system, available evidence is not strong enough to conclude that oral supplements reliably improve insomnia or sleep quality.

These products can still cause side effects or interact with medications. Claims that they treat anxiety, depression, chronic pain, insomnia, or other medical conditions should be avoided unless supported by appropriate regulatory approval and strong clinical evidence.

Questions to Ask Before Buying a Supplement

Before using a product marketed for sleep, consider asking a healthcare professional:

• Is there evidence for this ingredient and my specific sleep concern?
• Could it interact with my medications or medical conditions?
• Could it cause next-day drowsiness or affect driving?
• Has the product undergone credible independent quality testing?
• How long would it be appropriate to use?
• Could my sleep difficulty indicate an underlying sleep disorder?

Avoid combining multiple sleep products unless directed by a healthcare professional. Stop using a supplement and seek medical advice if you experience a concerning reaction.

Build a Sleep Environment That Supports Comfort

Supplements are not a substitute for diagnosing persistent sleep problems or maintaining healthy sleep habits. A regular routine and a bedroom suited to your comfort preferences can be sensible parts of a broader sleep plan.

Nest Bedding offers mattresses, toppers, pillows, and bedding for different comfort and temperature preferences. Explore the current collection and applicable trial terms to find options that fit your sleep environment.