Reported side effects have been minimal with use of eleuthero.¹⁴ Mild, transient diarrhea has been reported in a very small number of users. Eleuthero may cause insomnia in some people if taken too close to bedtime. Eleuthero is not recommended for people with uncontrolled high blood pressure. There are no known reasons to avoid eleuthero during pregnancy and breast-feeding. However, pregnant or breast-feeding women should be aware that some products may be adulterated with herbs that should not be taken in pregnancy, such as Asian ginseng. Only eleuthero from a trusted source should be used.