Miligram 200 na caffeine daga cikakken extract ɗin girbin kofi ya taimaka wa 'yan wasan keke masu horo su ƙara aiki da kashi 4.6 % a gwajin minti 15. Sai dai ba a sami hanzari wajen cika glycogen ba, kuma gwajin da aka yi ba shi da manyan ƙungiyoyi, yana kuma samun kuɗi daga kamfani ba tare da haɗin gwiwar ƙungiyar da caffeine ba.
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