That's a hard question to answer bro. First off, there are sooo many different brands and types of AS. Secondly, so many are very high quality and very good products in my opinion. If I were you I would decide on what type of AS that you want to take and buy some from a good source. If your source is good you shouldn't worry soo much about quality. Some things are real but not as good of quality like brovel stuff(suppossedly underdosed), but I have had great results from there products. But to put all that aside and answer your question a high quality not likely to be faked AS in my opinion are Sustenon 250 redijects by Organon.