In most studies on melatonin for insomnia in older adults, melatonin was taken up to two hours before bedtime for up to 13 weeks. (verywellhealth.com)
Don't most studies show that addicts do better with professional help? (scientificamerican.com)
That's because most studies on single human brain cells use dead rather than living tissue, and many others rely on cells from common laboratory animals, especially mice. (sciencemag.org)