Weight loss doesn’t come in a bottle: a recent study from Germany reveals that many over-the-counter weight-loss supplements don’t help you shed kilograms. The researchers tracked the effectiveness of nine diet supplements (each with a different key ingredient, such as bean concentrate) over a period of two months. Supplement users didn’t lose any more weight than those who took a placebo did. As study author Dr Thomas Ellrott, says, the pills can be sold without being proven effective. The best way to lose weight is through exercise and smart eating.