we dont know. it can alter your endocrin system in so many ways that we cannot pinpoint them all. in some ways it may cause damage that will not be noticed for years.
wait a couple more years and then give it a try, at 15 your hormones are flowing like crazy and u will have no problems growing with a lot of eating and a solid wieght training program.
wouldn't make a difference if it were tren extreme like you asked about or ANY other product like it. The long term effects starting at age 15 are def not worth the risk. Probably not what you wanted to hear.
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