Royal jelly has been found in studies to have many health benefits, but there are a few potential royal jelly side effects to be aware of before you decide to try it.
People who have an allergy to bee pollen, honey, poplar trees, or conifer trees may have serious allergic reactions to royal jelly and should not take it. Reactions may range from mild irritation to severe and may lead to anaphylactic shock or death.
People with asthma may see their symptoms worsen when taking royal jelly.
Royal jelly has been found in studies to have estrogenic properties. This makes it great for menopausal women but women who have estrogen-receptor positive breast cancer should steer clear of royal jelly because it may stimulate cell growth of that type of cancer.