That’s a fairly common concern with gaining muscle. The hormone audios won’t make you some kind of muscle monster overnight, unless you really overuse them daily for awhile.
They’re not as fast as anabolic steriods unless you overuse them a lot, and the mechanism is different. I expect many on this forum would be muscle monsters already from listening to The Testosterone Boost for other reasons if it were as quick.
They would be a somewhat gradual boost initially that you would be able to adjust if you start slowly, and can have many health benefits (confidence, mood, general wellbeing, etc.) at a lower level that would not turn you into a muscle monster.
You would probably just start to gain some muscle and definition at first, and you can always stop and adjust your listening if it’s going too fast or you reach a point at which you don’t want to continue gaining more.
Perhaps something to consider for later if you have too many fields for now.