Daily Star's biggest headlines straight to your inbox!Oscar Valdez's super featherweight world title defence against Robson Conceicao is in doubt after the defending champion tested positive for a banned substance.The Mexican boxer tested positive for phentermine, a stimulant banned by the Voluntary Anti-Doping Association.Phentermine gives the body strength and endurance, meaning an athlete would be able to work harder and longer until exhaustion in both training and in competition.
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