Test-tube studies indicate that Lomatium dissectum is a powerful antiviral, and compounds isolated from Lomatium suksdorfii have been shown to specifically inhibit HIV. Herbalists and healers experienced with these herbs believe they may also stimulate the immune system. Lomatium is considered powerful and should only be used with the guidance of an experienced practitioner. It contains anti-clotting substances and may be dangerous if your platelets are low or if you have problems with nose bleeds or heavy menstrual bleeding. Lomatium is generally not recommended during pregnancy. High doses may cause a rash resembling the measles.