Group B belongs to "supplement under consideration". There is not much clear evidence that this supplement can improve athletic ability, but coaches and athletes are interested in it. There is preliminary evidence that it may be effective and needs further verification. This tonic can be considered, but it is not explicitly recommended. For example: fish oil, glucosamine, glutamine, etc.
Group C belongs to "tonic with no clear proof of curative effect". Most sports supplements are concentrated in this group. Although these supplements are widely used by the public, they have not been proved to improve sports ability and may damage sports ability and health. Common supplements, which do not belong to A, B and D, are basically in C.
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Group D belongs to "forbidden supplement". Certainly not. However, it should be noted that AIS is aimed at athletes, so we should be cautious and consider the attitude of WADA (World Anti-Doping Organization) to a supplement. For example, testicle-promoting products such as tribulus terrestris saponins and maca are often divided into group D, which athletes cannot use, but ordinary people may not have to consider this aspect.
Group D supplements, including ephedrine, DHEA, growth hormone releasing agent and other things that can't be used.