2026 Supplement Guides
Ten evidence-based guides for reading supplement labels, comparing doses and forms, and checking safety and interactions.
All 2026 guides
Use the same evidence-first framework across every topic.
Choosing Magnesium: Elemental Dose, Forms, and Safety
An evidence-based guide to elemental magnesium, supplement forms, the NIH upper limit, side effects, and medication interactions.
Choosing Probiotics: Strains, CFU, and Expiration
Learn how to compare probiotic strain identity, CFU guarantees, expiration dates, storage instructions, and safety warnings.
Choosing Iron: Elemental Dose, Testing, and Timing
Compare elemental iron, forms, testing needs, medication timing, side effects, and child-poisoning precautions.
Calcium Carbonate vs Citrate: Dose and Timing
Compare elemental calcium, carbonate versus citrate, doses of 500 mg or less at one time, and medication interactions.
How to Choose Vitamin B12: Forms, Dose, and Deficiency Risk
Compare B12 forms and high-dose labels, and understand risk factors including vegan diets, age, GI surgery, metformin, and acid suppressants.
Choosing Zinc: Dose, Upper Limit, and Copper
Compare elemental zinc, the adult upper limit of 40 mg, long-term copper risk, product overlap, and antibiotic timing.
Comparing CoQ10: Evidence, Forms, and Interactions
Evaluate ubiquinone versus ubiquinol labels, evidence limits, official claims, and interactions with warfarin, insulin, and cancer treatment.
Glucosamine vs Chondroitin: Forms and Evidence
Understand glucosamine sulfate versus hydrochloride, chondroitin sulfate, conflicting osteoarthritis evidence, warfarin, and glucose cautions.
Curcumin vs Turmeric: Absorption and Liver Safety
Compare curcumin content, curcuminoid standardization, piperine and enhanced-bioavailability formulas, evidence limits, and liver warning signs.
Milk Thistle: Silymarin Standardization and Evidence
Compare milk thistle extract and silymarin, standardization, limited liver evidence, quality variation, contamination, allergies, and medicine use.