Delivery systems, such as capsules, tablets, powders, gels, and liquid formulations, are scientifically justified in the context of athletic and exercise aids because they optimize the bioavailability, absorption rate, and targeted delivery of active ingredients. These systems are not the active aids themselves, but are crucial for ensuring that the substances—like creatine, caffeine, amino acids, or electrolytes—reach circulation efficiently and in effective concentrations at the right time relative to exercise. Scientific studies have demonstrated that delivery systems can significantly impact the pharmacokinetics and efficacy of ergogenic aids. For example, creatine monohydrate in micronized powder form demonstrates better solubility and absorption than larger, less soluble particles. Similarly, caffeine administered in chewing gum or gels is absorbed more rapidly, providing a faster onset of action compared to standard capsules or tablets. Moreover, sustained-release formulations can maintain plasma concentrations of certain nutrients or stimulants, which may be beneficial during prolonged exercise. The choice of delivery system can also affect gastrointestinal tolerance, convenience, and compliance. Overall, the scientific literature consistently supports the use of delivery systems as a means to enhance the effectiveness and practicality of athletic and exercise aids.