Supplement Interactions & Safety
Supplements can interact with medications, medical conditions, and each other. Here's what you need to know before starting any supplement.
Safety Guides
Magnesium Safety & Interactions
Zinc Safety & Interactions
Iron Safety & Interactions
Calcium Safety & Interactions
Vitamin D Safety & Interactions
Omega-3 Safety & Interactions
General Supplement Safety Rules
Latest Safety Articles
Supplements to Avoid: 10 That Don't Work or Are Dangerous
Evidence-based review of supplements that are ineffective, overhyped, or potentially dangerous — including colloidal silver, high-dose vitamin A, and unregulated fat burners.
Can You Take Calcium and Magnesium Together? The Complete Guide
Calcium and magnesium compete for absorption — learn the optimal timing, ratios, and how to take both without reducing effectiveness.
Omega-3 Safety: Bleeding Risk, Contaminants & Drug Interactions
Is omega-3 safe? Learn about bleeding risk, mercury/contaminant concerns, drug interactions, and who should NOT take fish oil supplements.
Vitamin D Safety: Toxicity, Hypercalcemia & Drug Interactions
Is vitamin D safe? Learn about toxicity risk, hypercalcemia, drug interactions, and who should NOT take high-dose vitamin D supplements.
Calcium Safety: Kidney Stones, Heart Risk & Drug Interactions
Is calcium safe? Learn about kidney stone risk, cardiovascular concerns, drug interactions, and who should NOT take calcium supplements.
Zinc Safety: Side Effects, Upper Limits & Drug Interactions
Is zinc safe? Learn about side effects, copper depletion risk, drug interactions, and who should NOT take zinc supplements.
Magnesium Safety: Side Effects, Drug Interactions & Who Should Avoid It
Is magnesium safe? Learn about side effects, drug interactions (blood pressure meds, antibiotics, bisphosphonates), and who should NOT supplement.