It looks like taking too much might be a bad idea if you have kidney problems. Well , here is what they see as a safe
dose and some possible drug interactions:
Adult
•Adolescent and adult males: 270 - 400 mg daily
•Adolescent and adult females: 280 - 300 mg daily
•Pregnant females: 320 mg daily
•Breastfeeding females: 340 - 335 mg daily
A person' s need for magnesium increases during pregnancy, recovery from surgery and illnesses, and athletic training.