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Because the Food and Drug Administration (FDA) consider olive leaf extract to be a dietary supplement rather than a medicine, they do not monitor dose or quality of herbs and supplements.
There is also only limited scientific data on the possible side effects or long-term safety.
One study suggests that possible side effects may include muscle discomfort and headache. People who experience severe or concerning side effects should stop taking the extract and speak to their doctor.
It is also not clear whether olive leaf extract can interact with other medications. People who are taking prescription medications should speak to a doctor before taking olive leaf extract. *
