I am surprised to hear you of all people advise caution.

As it happens, I did conduct murine trials before writing, as liberating a specimen from Slughorn's collection is trivial. The toxicity profile was precisely as predicted, and extrapolating from the results, should be safe for human use in all doses short of by the gallon.

I agree that not informing Mr Weasley until we are certain it will be effective, as well as safe, is more kind, however. Hence, attempting to schedule human trial: it would be rudeness of the highest order to begin without the primary brewer's presence.