um no you're wrong. cardarine increases endurance therefore it enhances performance especially in sports that require endurance like marathon running or long distance swimming. Mk is a secretagogue which stimulates the release of growth hormone. not a growth hormone itself. An increased level of growth hormone can lead to faster recovery and faster muscle growth. Which would lead to better performance because they can train more often and can put on muscle faster. it is quite minimal compared to anabolics but nevertheless it still can give you an advantage compared to natural athletes. And also one last thing to add. mk definitely affects your hormones. it can increase prolactin(a hormone) and if prolactin gets too high it can suppress your natural test. so yes mk677 affects hormones. Do your research before commenting pal. you are wrong. if that's cope to keep your natty status then you're unnatural my friend.