Clinical studies have shown that St. John's Wort effectively treats mild to moderate depression. It may produce negative interactions with antidepressants and other drugs such as warfarin, phenprocoumon and cyclosporine. Korean ginseng . One of the top 10 best-selling botanicals in the United States, Korean ginseng is used to treat erectile dysfunction and as an antioxidant and immune stimulant. Studies suggest that the substance can help improve mood and physical function, but Dr. Mahady noted that the research methodologies of those trials were relatively poor.
Korean ginseng can interact with warfarin and phenelzine.
Because of a lack of safety data, women who are pregnant or lactating are advised to avoid using the herb. This substance is commonly used to treat memory impairment due to age, as well as Alzheimer's disease and vertigo. Clinical studies have shown gingko biloba can help improve symptoms of memory loss. The substance, however, can interact with warfarin. And because the product may inhibit the blood's ability to clot, side effects can include lung hemorrhaging or bleeding in areas with fragile blood vessels such as the gums.