SARMS are safe depending on the source. There is nothing to worry about when you consume sarms ethically for personal or performance enhancement reasons.
However, note that, there are millions of counterfeit SARMS out there, made and distributed from China without any quality control what so ever. Yes, these are not safe at all as they are not a dietry supplement. These can pose a risk to human consumption.
SARMS are very safe when obtained or puchase from professionals with inside knowledge and clean ethical manufacturing abilities. When you purchase SARMS this way, you need not bother at all. They are safe. But you have to be cautious when shopping for sarms online because there is plenty of fake out there.