Every drug you take has "side effects" that is the nature of a drug. You may not feel it but it is there.
If they are not noticeable and cause no detriment to health , so what?
We are talking about an Aspirin a day that MAY cause you some harm 40 years down the line as opposed to a gram of tren which makes you sweat like a bastard and feeling like you want to kill your entire family.
Side effects MAY be an issue, but its when they ARE an issue its important.
A fly hitting a train window slows the train down to a degree, but its not that it matters overall.