Astragalus, Milk Vetch, Huang Qi (Chinese) (Astragalus membranaceus) - Recent American research has focused on the ability of astragalus to restore normal immune function in cancer patients. Clinical evidence suggests that, as with a number of other herbs, cancer patients undergoing chemotherapy or radiotherapy recover faster and live longer if given astragalus concurrently. It raises immune resistance and manifestly improves physical endurance perhaps even superior to ginseng. Astragalus is often combined with angelica (Angelica sinensis) as a blood tonic.

Pau D'Arco (Portuguese), Lapacho (Spanish) (Tabebuia spp.) - Research in Brazil, which started during the 1960s, indicates that the bark is therapeutically useful in treating cancer, including leukemia. Many of the herb's constituents play a part in counteracting the growth of tumors, notably lapacho, which inhibits the growth of tumor cells by preventing them from metabolizing oxygen.

Ashwagandha (Hindi) (Withania somnifera) - Research in 1970 showed that withanolides are anti-inflammatory and inhibit the growth of cancer cells. Trials in 1980 indicated that ashwagandha increases hemoglobin levels and helps recovery from chronic illness. It has a high iron content and is used as a restorative for the elderly and chronically ill. Its sedative action calms and strengthens the nerves, and encourages restful sleep, making it useful for countering the debility that accompanies long-term stress.