The greatest flesh producer of the age

I have nothing to say about this, except that if this pill were available now and did the OPPOSITE of what it was supposed to do, it would be selling millions, if not billions of bottles online. There must have been a lot of skinny people back in the days of patent medicine. Being beefy (forgive the pun) and filled-out was the desirable thing, perhaps to dispel the horror of an untreatable, wasting sickness like cancer or tuberculosis. Then you'd at least have "flesh" to live on. 
"Rounds out the figure and gives strength to the whole system" is the giveaway.