More than half of Americans are taking them , fueling a $ 30 billion industry . David Seres : But supplements are not the amazing panacea that we are led to believe . He says vitamin C and selenium supplements , for example , may not be safe for humans . It is a hopeful sign that this issue has come to the attention of the Senate Subcommittee on Consumer Protection . Seres : We need to reassess regulation of dietary supplements and educate the public .
More than half of Americans are taking them , fueling a $ 30 billion industry . David Seres : But supplements are not the amazing panacea that we are led to believe . He says vitamin C and selenium supplements , for example , may not be safe for humans . Seres : We need to reassess regulation of dietary supplements and educate the public .