Food supplements are too expensive and their health benefits are unproven, according to The Foundation for Consumers. The group launched a campaign today to warn the public to avoid such supplements arguing that they could do more harm than good. A study completed by the group found that a worrying 52% of people used supplements despite the fact that they didn't need them, convinced by advertising and direct sales strategies. People lack adequate health information, according to foundation manager Saree Ong-somwang, and are at the mercy of a plethora of products that have come with free trade.