Dr Dre and his label, Aftermath Entertainment, sued Napster after the company failed to co-operate with a written request to remove his tracks from its database.

BBC: Napster

Dr. Bronner's label, while it does proudly proclaim all of the above, mainly looks like a religious pamphlet.

FORBES: Dr. Bronner's Organic Discord

The combination of little benefit and potential risk underscores the need "to set a pretty high bar" for the off-label uses of medicines, Dr. Yank said.

WSJ: Hemophilia Drug's Off-Label Use Is Faulted

Dr. Wolf says California in 2012 began requiring a label on prescription drugs similar to the one the researchers tested, and there is a push in New York to make similar changes.

WSJ: Ring, Buzz, Flash: It Must Be Time to Take Your Medicine

Dr. JOSHUA OFMAN (Vice President, Amgen): The FDA label acknowledges that a certain risks cannot be excluded, but they have clearly stated that the lowest dose should be use to avoid transfusion with an upper safety limit of 12, leaving some discretion for physicians to make those determinations based on their individual patient needs.

NPR: Doctors in Medicare Fight Over Right to Prescribe

"I feel strongly that it's not safe or advisable for people to take this off-label until we get those critical pieces of information, " said Dr. Sperling.

WSJ: Alzheimer's Families Clamor for Drug

Dr. Yank and her colleagues used a database of hospitalizations to estimate national patterns of off-label use of the drug.

WSJ: Hemophilia Drug's Off-Label Use Is Faulted