Pregnant or breastfeeding women, and those trying to conceive, should avoid St. Johns wort. 장기 이식 수혜자는 장기 거부 반응을 일으킬 수 있으므로 세인트존스워트를 섭취해서는 안 됩니다. In one small study, St. Johns wort was associated with elevated thyroid stimulating hormone TSH levels.