The reason Kobe, A-Rod, and other athletes travel to Germany for their biologic treatments involves a vague FDA regulation
that mandates that all human tissues (such as blood and bone marrow) can only be "minimally manipulated," or else they are classified as a drug and subject to much stricter governmental regulations.
The problem, of course, is figuring out what "minimal" means in the context of biologics. Can the blood be heated to a higher temperature, as with Regenokine? Spun in a centrifuge? Can certain proteins be filtered out?2 Nobody knows the answer to these questions, and most American doctors are unwilling to risk the ire of regulators.