GLOSSARY

Fat Burner is a category or marketing term for products claimed to increase thermogenesis, fat mobilization or metabolism. These changes do not automatically establish meaningful body-fat loss.

A compound's normal biochemical role is not enough to justify supplementation in a healthy trained athlete. Phosphate, inosine, ribose, coenzyme Q10 and other marketed products have distinct mechanisms and uneven performance evidence. Findings from clinical populations, laboratory markers or deficiency correction cannot simply be transferred to competition. Check the actual ingredient and protocol, recognize uncertainty and adverse effects, and prefer a meaningful measured benefit over a story about providing more cellular energy. Adding more products can also complicate interpretation.

A credible supplement claim needs relevant controlled evidence, an appropriate comparison and a meaningful outcome. Randomization, placebo control and blinding reduce different sources of bias but do not guarantee a useful result. Sample size, uncertainty, training status, sex, diet and protocol affect interpretation. A pooled estimate is not a promise to every individual. Mechanistic plausibility, a changed biomarker, exercise capacity and actual competition performance are distinct levels of information that should not be treated as interchangeable.

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.

Supplement safety depends on ingredient, dose, duration, health status and other exposures. Natural origin does not guarantee safety, and absence of a reported adverse event in a small trial does not establish long-term safety. Medication interactions, pregnancy, age and kidney or liver disease can change the decision. Distinguish an event occurring during use from a causally established adverse effect. New or severe symptoms require stopping the suspect exposure and appropriate assessment rather than increasing the dose to overcome poor tolerance.

Label accuracy, ingredient identity, potency, contamination control and manufacturing traceability are separate aspects of quality. A proprietary blend may conceal the amount of each ingredient, preventing comparison with research. A certificate of analysis applies to specified tests and samples, not every possible hazard. Verify the exact product and batch in an independent certification program when relevant. Good manufacturing practice and third-party testing can reduce certain risks without proving efficacy or guaranteeing that every batch is free of prohibited substances.

A supplement can address a defined nutrient shortfall, provide a convenient sports-food format or target a specific performance mechanism. These purposes require different evidence and assessment. A product is not necessary simply because it is marketed to athletes, and normal training fatigue does not identify a nutrient deficiency. Begin with the athlete's diet, health, training and practical constraints, then define the expected benefit, suitable outcome and stopping or review point before adding a product.