Magnesium glycinate or taurate, fish oil, and AFib alerts: how are you timing them with metoprolol and anticoagulants?
Supplement stacks around heart rhythm drugs deserve a structured check. Points to compare: (1) Magnesium: the NIH Office of Dietary Supplements lists a 350 mg/day upper limit for supplemental magnesium in adults. Higher amounts commonly cause diarrhea, and kidney disease raises the risk of accumulation. (2) Fish oil: trial meta-analyses link higher-dose omega-3 (above 1 g/day) with more AFib, so ask your cardiology team about your dose. (3) Chondroitin and boswellia: human interaction data with apixaban or rivaroxaban are limited, and a theoretical bleeding concern is why many pharmacists ask you to disclose them. (4) If you take levothyroxine, separate magnesium by at least 4 hours. Please share: your elemental magnesium dose, your fish oil EPA+DHA total, what time of day you take each item, and whether your pharmacist reviewed the list.
The NIH Office of Dietary Supplements sets a 350 mg/day Tolerable Upper Intake Level for supplemental magnesium in adults. A 2021 Circulation meta-analysis (Gencer et al.) reported about a 25% higher AF risk with marine omega-3 supplements overall, and about 49% higher at doses above 1 g/day.