Artichoke and several other plants have been associated with reduced total serum cholesterol levels in preliminary studies.
Black cohosh and other plants that contain phytoestrogens (plant molecules with estrogen activity) have been found to have some benefits for treatment of symptoms resulting from menopause.
Echinacea extracts have been shown to limit the length of colds in some clinical trials.
Garlic has been found to lower total cholesterol levels, mildly reduce blood pressure, reduces platelet aggregation, and has antibacterial properties.
St John's wort has been found to be more effective than placebo for the treatment of mild to moderate depression in some clinical trials.