More than half of Americans take supplements regularly.

Spend any time watching TV or scrolling through social media and you will inevitably see ads for pills, powders and medicines that promise to grow muscle, remove body fat, improve your focus and revitalize your youth.

Most of us have used them. In the latest count, the National Center for Health Statistics found that over 50% of all adults in America have used a supplement in the last 30 days. The center used data from 2017 and 2018, but recent surveys suggest that figure is closer to over 70%.

Globally, the nutritional supplement industry was said to be worth over $ 140 billion by 2020. In the United States alone, that figure is estimated to be around $ 36 billion – despite evidence that most of these supplements do not work.