There have been a significant number of athletes who have committed Anti-Doping Rule Violations by virtue of positive tests for methylhexaneamine, which is a prohibited stimulant.The release states further that:
This substance is known under several other names, including 4-methyl-2-hexanamine; 4-methyl-2-hexylamine; 2-amino-4-methylhexane; 1,3-dimethylamylamine; 1,3-dimethylpentylamine; 2-Hexanamine; 4-methyl- (9CI); Forthan; Forthane; Floradrene; methylhexaneamine; Geranamine; DMAA. Athletes should avoid products that claim to contain any of these substances...
Players are responsible for everything they ingest, and a positive anti-doping test cannot be excused by a contaminated supplement.
It's a strange release because as far as I know only 2 tennis players have ever tested positive for methylhexaneamine: Ivo Minar and Robert Kendrick.
Why did they put this note out? The only other time the ITF has done something like this was when the WADA put out a statement on clenbuterol, but there's no WADA references for this release.