will not have any effects donating with on sarms. you can donate on steroids too. you do have to fill out questions but lie on it, they want to eliminate any chance you are carrying diseases. don't say you travel around the world, don't say you have unprotected sex, don't say you inject shit in your body, etc. and then you gotta pass the next test which is blood pressure, body temp, etc. that is where a lot of people get fucked. so make sure you donate every chance you get and keep your own health good or they will reject you