Supplements are unregulated in most countries. Contamination, mislabeling, and dangerous dosing are common. More is not better — some supplements are actively harmful.
30%of supplements contain undeclared ingredients
True or false
True or False
Antioxidant supplements extend lifespan.
Taking antioxidant supplements extends lifespan
Meta-analyses show antioxidant supplements (vitamins A, C, E) do NOT extend lifespan and may slightly increase mortality. Your body needs some oxidative stress for healthy signaling.
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Supplement red flags
Tap each warning sign to learn why it matters.
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Fact
Specific supplements that have HARMED in trials
Beta-carotene (high-dose) increased lung-cancer risk in smokers (CARET, ATBC trials — both stopped early). Vitamin E (>400 IU/d) raised all-cause mortality (Miller 2005 meta-analysis). Folic acid (high-dose) accelerated some cancer growth. Calcium >1500 mg/d linked to vascular calcification. The pattern: high-dose isolated antioxidants and minerals consistently disappoint or harm. Food forms remain protective.
Trial-stoppedhigh-dose antioxidant trials
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Drug-supplement interactions
Tap each — common combos that genuinely matter.
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Takeaway
Key Takeaway
Buy third-party tested supplements (NSF, USP, Informed Sport). Avoid proprietary blends. Test your blood levels before supplementing. Food first, always.
Track your progress
Read the cards above, then mark this lesson complete to track your progress.