Melatonin, a common sleep supplement, may offer meaningful relief from chronic muscle and joint pain, according to a comprehensive analysis of 23 randomized controlled trials involving over 2,000 participants. The findings suggest this inexpensive, widely available supplement could become a safer addition to pain management plans, particularly for people whose sleep is disrupted by chronic pain (Source 1, 2, 3).

The research, published in the journal Pain by scientists at the University of Sydney, analyzed data from studies conducted across nine countries, including the United States, Russia, Brazil, Egypt, and China. Participants had conditions ranging from low back pain and osteoarthritis to fibromyalgia, as well as people recovering from joint replacements and spinal surgeries.

How Does Melatonin Help With Chronic Pain?

Researchers believe melatonin may reduce pain through multiple pathways. The most direct connection involves sleep: by improving sleep quality, melatonin may indirectly reduce pain by boosting mood, lowering anxiety, and helping people stay more active during the day, all of which can decrease pain intensity. Additionally, melatonin may have its own pain-relieving properties through antioxidant and anti-inflammatory effects that could help modulate pain signals in the body.

"Getting better and deeper sleep is clearly important in chronic pain, especially nociplastic pain," said Daniel Clauw, a professor of anesthesiology, medicine, and psychiatry at the University of Michigan in Ann Arbor.

Daniel Clauw, Professor of Anesthesiology, Medicine, and Psychiatry at the University of Michigan

This connection between sleep and pain is particularly significant: roughly two-thirds of people with chronic pain also struggle with sleep problems, creating a difficult cycle where pain disrupts rest and poor sleep worsens pain.

What Did the Study Actually Find?

When researchers combined results across all studies, melatonin reduced chronic pain by approximately 9 points on a 0 to 100 scale, where 0 represents no pain and 100 represents the worst pain imaginable. The most rigorous trials showed reductions closer to 10 points, a magnitude comparable to widely used over-the-counter pain medications like ibuprofen and acetaminophen (NSAIDs) (Source 1, 3).

Beyond pain relief, melatonin improved sleep quality by about 11 points on the same scale. However, the research showed different results for acute pain after surgery: melatonin performed only slightly better than placebo, with improvements of just 2.5 to 3.5 points, which researchers noted was unlikely to be meaningful for most patients.

Interestingly, the studies found no clear dose-response relationship, meaning higher doses did not necessarily produce more pain relief. Doses in the trials ranged from 1 to 10 milligrams, with 3 milligrams being the most commonly used for chronic pain and 5 to 6 milligrams typical for postoperative pain (Source 1, 3).

Steps to Consider Before Trying Melatonin for Pain

• Start with a low dose: Experts recommend beginning with 1 milligram of melatonin and increasing only if needed, with a typical range of 3 to 6 milligrams. Doses greater than 10 milligrams can sometimes disrupt sleep and have the opposite effect.
• Talk to your doctor first: Before starting melatonin, especially if you take other medications or have underlying health conditions, consult with a healthcare professional to discuss potential drug interactions and whether it is appropriate for your situation.
• Choose quality supplements carefully: The FDA does not review dietary supplements for safety or effectiveness before they reach the market. Look for brands validated by independent third-party testing, as some over-the-counter melatonin products contain different amounts than their labels claim.
• Use it as an addition, not a replacement: Melatonin should complement existing pain management strategies, not replace current medications without medical guidance. It may be particularly useful for people whose chronic pain is worsened by sleep problems (Source 1, 3).

Is Melatonin Safe for Long-Term Use?

The good news is that melatonin appears to be well tolerated with minimal side effects. The most commonly reported adverse effects were mild and temporary, including nausea, dizziness, headaches, and drowsiness. No serious adverse events were reported across any of the trials reviewed (Source 1, 3).

Melatonin is generally considered safe for short-term use of less than three months. However, long-term use of higher doses may make melatonin less effective over time, so the "start low and go slow" approach is recommended.

"Melatonin is already in people's homes, it's inexpensive, and we know it's safe. What's exciting is that melatonin may also help manage chronic pain, opening the door to reducing reliance on medications that come with more risks," said Kangchao Wu, lead author and PhD student at the University of Sydney.

Kangchao Wu, PhD Student, Musculoskeletal Research Hub at the Charles Perkins Centre

The affordability of melatonin is another significant advantage. In Australia, melatonin typically costs less than $1.50 per tablet, making it accessible to people seeking alternatives to more expensive pain medications.

Why This Matters for Chronic Pain Management

With musculoskeletal pain affecting up to 47 percent of people globally, finding safe, non-addictive pain relief options is increasingly important. Growing concerns about opioid misuse and the long-term side effects of some pain medications have created a need for alternatives that can be integrated into broader pain management plans.

Experts emphasize that while the evidence is promising, melatonin should not replace established pain treatments. Instead, it represents what researchers call "drug repurposing," using an existing, well-understood medication in a new way to address a widespread health problem.

"The level of pain relief we observed is comparable to some conventional treatments, but this does not mean melatonin should replace them. Rather, it may offer a safer additional option within a broader pain management plan," explained Wu.

Kangchao Wu, PhD Student, Musculoskeletal Research Hub at the Charles Perkins Centre

While researchers say further large-scale studies will strengthen the evidence base, they believe the current findings are strong enough to support cautious use of melatonin as an adjunct therapy. For people living with chronic pain who also struggle with sleep disruption, melatonin may be worth discussing with a healthcare provider as part of a comprehensive approach to managing both conditions (Source 1, 3).