Potential side effects though rare can be:

1 – An individual being allergic to any of the ingredients in MigreLief. If you are allergic to any of the ingredients, cease taking the product.
2 – Some individuals may experience transient diarrhea when ingesting magnesium.
3 – Some individuals can experience gastro-intestinal upset when taking dietary supplements.
4 – Riboflavin (Vitamin B-2) can cause urine to become bright yellow. This is normal and harmless.
5 – Though rare, some people can feel achy, tired and experience a headache if they abruptly stop taking feverfew. It is recommended that you stop gradually cutting the dose from one daily to once every other day for a week and then stop.