Hi Lauren, Ergogenic aids is just a different name for 'nutritional supplements' on all it's range. They are used as extra help where food on it's own cannot provide all macro and micronutrients to the diet of a specific person. They can be presented in different forms e.g. pills, gels, powders. etc.; and they can have different functions e.g. provide fuel, boost immune system, nutrient deficiencies, muscle building, etc. The range of supplements available in the market today is very wide. Every brand and product will have thousands of claims and will probably make it confusing for the consumer if it is something they should have. A balanced and varied diet can cover all nutritional needs, however, there will be scenarios were people can be benefit from selecting an adequate supplement to complement their diet and achieve their goals. A registered dietitian can help you assess your lifestyle and needs and guide you in the right direction.