Are supplements healthy or can they even cause harm? NDR reporter Rieke Sprotte goes in search of clues. In a simple experiment, she finds out that anyone and everyone can bring such capsules, tablets and the like onto the market. Even more worrying: There are no prescribed maximum amounts for ingredients. Dietary supplements are only checked in individual cases. And only when they are already on the shelves for sale. This opens up the market for dubious products. Are they allowed to?