Chronic leukaemia tends to progress slowly over the course of many years. Chronic leukaemia is classified according to the type of white blood cells affected by cancer. This topic focuses on chronic lymphocytic leukaemia, which affects types of white blood cells called lymphocytes.
However, like many drugs and herbal remedies, oil of oregano can have side effects and may produce allergic reactions in those sensitive to this family of plants. Origanum vulgare, the source of oil of oregano, comes from the same plant family as basil, hyssop, marjoram, mint, sage and thyme.
1 If you are taking blood thinning drugs, oil of oregano acts similarly in thinning the blood. If you take oregano oil with blood thinning drugs your blood pressure may drop too low and you blood may become too thin.  Oil of Oregano is not recommended during pregnancy or while breastfeeding.