Top Doctor: The hidden dangers in your daily multivitamin | Dr David Seres

Mel Gibson helped deregulate the $40 billion supplement industry

In 1994, a law called DSHEA removed FDA oversight from dietary supplements after a Hollywood campaign featuring Mel Gibson generated more letters to Congress than the entire Vietnam War. Supplements can now be sold without proof of benefit and can make health claims like "supports heart health" without direct evidence. More than half of Americans take some form of supplement.

"Can supplements make health claims without real proof? Yes."

Vitamin E supplementation increased prostate cancer by 18%

A 10-year study of 30,000 men found that supplementing with vitamin E or selenium increased prostate cancer rates by about 18%, the exact opposite of what was expected. Low vitamin E levels in cancer patients were an effect of the cancer, not a cause. This illustrates a fundamental flaw in supplement marketing that confuses correlation with causation.

"Anyone who received either vitamin E or selenium had about 18% increased rate of prostate cancer."

How supplement companies manipulate statistics to fake results

A memory supplement company was litigated for 7 years for manipulating statistics. Their overall trial showed no benefit, but after 30+ subgroup analyses they found two that went in the right direction and marketed those. The product was a protein that biologically could not reach the brain intact. This is a cautionary tale about p-hacking in supplement marketing.

"If you take a large enough data set and analyze it enough times, you'll find something. It's a statistical certainty that you'll find something that is statistically significant but not relevant."