In fact, 28 days is a standard recommended limit for drugs available over the counter. It is fairly hard to do damage to yourself, with those sorts of drugs, in that time - but after that you really need the advice of a doctor who understands all of the risks involved.

I can't believe you just said "understands all the risks involved." On the basis of mouse studies and some completely uncontrolled, non-blind 6-year longitudinal study. Or meta-analysis. Or whatever.

Is this the best information we have or can get? Sure. Are the words understands all appropriate? No, they are not.

Aiming for this kind of certainty, and constantly, unconsciously boasting of it, is how postmodern medicine works itself into a box where it's completely unable to think. The information available in this case is shite. But the decision still needs to be made.