Lemon Balm cut agitation in patients with severe dementia and Alzheimer's patients, reports a 2002 study in the Journal of Clinical Psychiatry. Lemon balm appears to calm an overactive thyroid, according to Eric Yarnell, ND, an assistant professor of botanical medicine at Bastyr University.

For Lemon balm's calming effects, try a daily tea made with one-half to one full dropper of tincture or 1 to 2 teaspoons of dried herb steeped in 1 cup of hot water for 5 to 10 minutes, says herbalist Linda Different Cloud, a PhD