Rosemary
Excess rosemary is not safe for pregnant women (may cause abortion in the first three months of pregnancy because it is too stimulating) and for those with high blood pressure. Using it in normal amounts in recipes should be fine unless you have an allergy to it (which I’ve never heard of yet.) Using too much over an extended period of time, it may cause convulsions in people who are prone to them (small amounts stimulate the circulation and help some epileptics).