From The New York Times:
At a time when Americans are buying and taking record amounts of supplements — well over half of adults consume one — some doctors and dietitians are trying to convince patients to take it easy.
A wide variety of gummies, pills and powders are categorized as supplements, including vitamins and minerals, compounds like creatine and herbal products such as ashwagandha and kava. Almost all doctors say a few of them have their place; women benefit from taking folic acid, for example, when trying to have a baby. Some people have vitamin or mineral deficiencies that supplements can help address.