GLOSSARY

Good Manufacturing Practice (GMP) addresses controlled production practices and consistency. Manufacturing compliance is not proof of ergogenic efficacy or zero doping risk.

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.

Competitive athletes remain responsible for substances found in their samples under applicable anti-doping rules. A supplement may contain undeclared ingredients, and a label or manufacturer assurance cannot establish that it is permitted. Check the official prohibited list effective on the event date, including restrictions by route, timing or sport when applicable. Independent sport-focused certification can reduce risk but cannot eliminate it. Keep product and batch records, and obtain current advice from the relevant anti-doping organization rather than relying on a generic product claim.

For example, verify the exact product and batch rather than accepting a logo displayed in an advertisement. A certificate may describe only certain tests, while the athlete still needs to consider ingredient amounts and evidence. Retaining the label and batch information supports traceability but does not turn a tested product into a risk-free one.

A supplement's form influences convenience, measurement and storage rather than independently proving efficacy. Scoops measure volume and can vary in delivered mass; serving instructions and active amounts need careful reading. Heat, moisture and light can affect stability according to the product. Keep the original label and batch information, follow storage instructions and avoid treating an expiration date as proof that every improperly stored product remains sound. Value should consider the cost of a useful, appropriate dose and its risks, not only the container price.

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.

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.

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.