Beetroot contains nitrates, meaning they boost our body's levels of nitric oxide. Nitric oxide - a gas already naturally occurring in the body - tells our blood vessels to expand, increasing blood flow and lowering blood pressure. A study showed that drinking just one glass of beet juice (or eating the equivalent amount) could reduced systolic blood pressure by a significant 4-5 mmHg. This makes beetroot an effective supplement for preventing and treating some cardiovascular conditions.