A recent review found melatonin can reduce chronic musculoskeletal pain, producing effects similar to common over‑the‑counter pain relievers in the trials analyzed. The benefit was clearest for chronic pain lasting three months or longer; evidence for reducing acute post‑surgical pain (after joint replacements, spinal procedures, fractures, etc.) was weaker and more mixed.
How it might work
Melatonin may ease pain in two ways. First, the hormone appears to have intrinsic antioxidant and anti‑inflammatory properties that can influence the pain process. Second, by improving sleep, lowering anxiety and mood symptoms, and helping people stay more active during the day, melatonin can indirectly reduce how intense pain feels. Those indirect effects may be especially important for chronic pain tied to poor sleep, persistent inflammation, or nervous system sensitivity. In contrast, acute postoperative pain may respond differently, which could explain the smaller or inconsistent effects in that setting.
What the study found about dosing and safety
– Short‑term, low‑dose melatonin showed the most evidence of benefit. The researchers defined short term as less than three months and highlighted doses under 5 milligrams, with many trials using 3 mg.
– Side effects were generally mild and occurred at similar rates to placebo. The most common complaints were headache, nausea, and daytime drowsiness.
– The authors and other experts frame melatonin as a possible adjunctive option for chronic musculoskeletal pain, not a replacement for established treatments.
Who should talk to a doctor first
– Anyone considering melatonin for pain should discuss it with their clinician, especially if they do not have sleep problems or are already taking prescription or over‑the‑counter medications. Melatonin can interact with other drugs and supplements.
– People with certain health conditions, such as liver or kidney disease or some forms of inflammatory arthritis, should not start melatonin without medical clearance.
Regulation and long‑term safety
In the United States, melatonin supplements are regulated as dietary supplements, not drugs, so they are not reviewed or approved by the FDA for safety or effectiveness before sale. Manufacturers are responsible for product safety and labeling. Evidence about long‑term safety is limited. Most trials in the review lasted from four weeks up to three months. An observational study presented at an earlier conference associated melatonin use longer than a year with higher rates of heart failure diagnosis and hospitalization in people with insomnia, but that finding did not establish causation. Because long‑term effects are uncertain, most experts advise caution about prolonged nightly use without medical supervision.
Practical takeaways
– Melatonin may be worth considering as an add‑on for chronic musculoskeletal pain, particularly when sleep problems coexist with pain.
– Short courses at low doses (commonly around 3 mg in trials, generally under 5 mg) were the context in which benefits were observed.
– Discuss melatonin with your healthcare provider before starting it to review potential interactions, contraindications, and whether it fits into an overall pain management plan.
– Maintain good sleep hygiene and pursue other evidence‑based pain treatments; melatonin is not a standalone cure for chronic pain.
If you experience persistent or worsening pain, new symptoms, or concerning side effects while using melatonin, contact your healthcare provider promptly.
