What Blocks Calcium Absorption: Supplements and Food Timing
Phytates, oxalates, excess zinc, and magnesium compete with calcium absorption. Taking calcium correctly doubles its effectiveness without changing your dose.
February 26, 2026·5 min read
Fat-Soluble Vitamins: Why Timing and Fat Matter for Absorption
Vitamins A, D, E, and K require dietary fat for absorption. Taking them on an empty stomach wastes up to 50% of your dose. Timing matters significantly.
February 26, 2026·5 min read
Grapefruit and Supplements: CYP3A4 Inhibition Explained
Grapefruit irreversibly inhibits the gut enzyme CYP3A4, causing certain drug and supplement levels to spike unpredictably for up to 24 hours.
February 26, 2026·4 min read
St. John's Wort Drug Interactions: The Complete Warning List
St. John's Wort interacts with over 70 medications by inducing CYP3A4 and P-glycoprotein. This complete guide covers every major drug category affected.
February 26, 2026·4 min read
Complete Guide to Supplement Timing: Morning, Night, With Food
When you take supplements matters as much as which ones you take. This complete guide organizes every major supplement by optimal timing for maximum effectiveness.
February 26, 2026·5 min read
Supplements and Alcohol: What You Should Not Mix
Kava and alcohol together can cause severe liver damage. High-dose niacin with alcohol causes dangerous flushing. Know which supplements are unsafe with drinking.
February 26, 2026·5 min read
Supplements to Stop Before Surgery and Anesthesia
Several supplements increase bleeding risk, affect anesthesia depth, or cause cardiovascular instability during surgery. Most should be stopped 1-2 weeks before.
February 26, 2026·4 min read
Supplements and Caffeine: Synergies and Risks
Caffeine synergizes with L-theanine for focus and with creatine for performance, but amplifies anxiety-inducing supplements and raises blood pressure with stimulants.
February 26, 2026·5 min read
Supplements That Interact With ACE Inhibitors
Potassium supplements and potassium-sparing herbs can cause dangerous hyperkalemia with ACE inhibitors. Know the risks before supplementing.
February 26, 2026·4 min read
Supplements That Interact With Antibiotics: Timing and Absorption
Calcium, iron, and magnesium bind to certain antibiotics in the gut, drastically reducing their effectiveness. Timing your supplements correctly is critical.
February 26, 2026·4 min read
Supplements That Interact With Antidepressants: SSRIs, SNRIs, MAOIs
St. John's Wort, 5-HTP, and SAMe can cause dangerous serotonin syndrome when combined with antidepressants. Here is what to avoid.
February 26, 2026·4 min read
Supplements That Interact With Beta-Blockers
Calcium, magnesium, and certain herbs can interact with beta-blockers used for heart rate and blood pressure. Learn what is safe and what to avoid.
February 26, 2026·4 min read
Supplements That Reduce Birth Control Effectiveness
St. John's Wort and certain herbal supplements can reduce hormonal contraceptive effectiveness by increasing liver enzyme activity. Here is what to know.
February 26, 2026·4 min read
Supplements That Interact With Blood Thinners: Warfarin and Aspirin
Fish oil, vitamin E, ginkgo, and garlic can amplify the effects of warfarin and aspirin, raising bleeding risk. Know what to avoid.
February 26, 2026·4 min read
Supplements During Chemotherapy: What Oncologists Say
Antioxidant supplements may interfere with chemotherapy by protecting cancer cells from oxidative damage. Here is the evidence and what oncologists recommend.
February 26, 2026·4 min read
Supplements That Interact With Diabetes Medications
Chromium, berberine, and cinnamon can amplify blood sugar lowering from insulin and oral diabetes drugs, causing dangerous hypoglycemia. Know the risks.
February 26, 2026·4 min read
Supplements That Interact With Immunosuppressants
St. John's Wort can cut cyclosporine levels in half, triggering organ rejection. Immune-stimulating supplements also threaten transplant stability.
February 26, 2026·4 min read
Supplements That Interact With Metformin
Metformin depletes B12 and interacts with several supplements. Learn what to take, what to avoid, and how to optimize metformin therapy.
February 26, 2026·4 min read
Supplements That Interact With NSAIDs: Risks and Alternatives
Fish oil, ginkgo, and garlic amplify NSAID bleeding risk. Certain supplements also stress the kidneys when combined with ibuprofen or naproxen.
February 26, 2026·4 min read
Supplements That Interact With Statins: What to Avoid and Why
Certain supplements can raise statin blood levels, increasing muscle damage risk. Learn which to avoid and which are safe to take alongside statins.
February 26, 2026·4 min read
Supplements That Interfere With Thyroid Medication Absorption
Calcium, iron, and magnesium can block levothyroxine absorption by up to 40%. Learn the timing rules that protect your thyroid medication.
February 26, 2026·4 min read