Makers of melatonin supplements have 18 to 24 months to voluntarily add child-deterrent packaging and improve cautionary language on labels of over-the-counter products the leading trade association for the dietary
Low-quality evidence shows using cannabis can help neuropathic pain, multiple sclerosis-associated spasticity, and chemo-induced nausea or vomiting. For most other problems, the effects are unclear.
​Most supplements have not been rigorously tested for safety or effectiveness, said Dr. JoAnn Manson, a professor of medicine at Harvard Medical School.
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