T-Teen, you wanted to know if the use of “M” for you at the age of 17 was safe and effective. Because I am also 17 and very curious for the answer, I emailed Biotest. Here is a copy of my email: ~~~~~~~T-Teen posted a question on the forum about the safety and effectiveness of “M” for teenagers. Like him, I am 17. The replies were vague and unsure, and since I am curious myself, allow me to throw this question at the real experts: Is “M” safe and effective for teenagers? Thank you!~~~~~~~Well, Biotest responded. Their answer: Yes! Hope that helps.