SARMs often share different legal procedures across different countries or regions. Some supplements that would be considered illegal in one country could be considered legal in another country, so much of this depends on where you are in the world.
With that said, yes, in most cases, supplements require some kind of approval. More specifically, most countries usually have some kind of drug testing branch that’s tasked with checking the kinds of medicine and supplements the citizens are consuming. Usually, these organisations or departments are in charge of making sure the supplement is pure.
Sometimes other third party organisations can be the ones testing the supplements, such as labs, but often this is done by the aforementioned government organisations.
