GLOSSARY

Nitrite is an intermediate nitrogen-containing compound in the dietary nitrate pathway, distinct from nitrate and nitric oxide.

Dietary nitrate can enter a nitrate-to-nitrite-to-nitric-oxide pathway involving oral bacteria and subsequent chemistry. Nitrate-rich beetroot preparations have been studied for exercise economy and performance, with effects varying by population and task. The nitrate content matters more than beverage volume alone. Antibacterial mouthwash can disrupt part of the oral pathway, but oral-health decisions need appropriate context. Increased nitric-oxide availability or a changed oxygen cost does not guarantee that every athlete will perform better in every event.

Arginine is a substrate for nitric oxide synthase, while citrulline can contribute to circulating arginine through metabolism. This biochemical connection does not establish that every arginine or citrulline product improves blood flow or sporting performance. Citrulline malate contains a mixture whose actual citrulline amount and formulation should be checked. A transient muscle pump is not equivalent to long-term hypertrophy. Evaluate gastrointestinal tolerance, interacting exposures and the specific controlled evidence rather than accepting a nitric-oxide-booster label as a measured outcome.

Absorption, distribution, metabolism and elimination determine how an ingredient reaches circulation and tissues. Plasma concentration does not directly establish muscle uptake or a useful performance effect. Half-life describes a concentration decline under defined conditions, while time to peak describes when a measured maximum occurs. Food, formulation, repeated use and individual physiology affect these processes. A faster or larger blood peak is therefore not automatically evidence that a formulation is better for the athlete's intended task.