PRL-8-53 writeup I completed

It's fairly strange. The one trial used 5mg (which I cited) but then the patent states

"An oral dose of 0.01 mg./kg. or more up to approximately 20 to 50 milligrams per unit dosage thrice daily in the higher mammals and about to 100 times this dose in laboratory test animals parenterally is preferred."

The fact that they used 5mg in the actual study with people should be the most important bit of information I'd say.