IMO, the stories behind ads are very often more interesting than the bare image. Disclaimer: did my best with this, but the thread is thin.

The ad's Mrs. Anderson promises info on curing one's husband of drinking. She'll tell you for free! But it doesn't disclose her remedy, unless you write in. We don't know anything more from the ad image alone.

I found a mention of this ad in "The Medical World" (TMW), Volume 25, from 1906. Enter the intrepid 1906 investigators! TMW was a legit med journal, to the extent of that era's knowledge.

TMW discovered that Mrs A. indeed doesn't sell anything, but she is a front for a quack med company in Chicago. Mrs A. sends you a letter about how "Alcola" from said quacks cured her own husband of alcoholism. The reader should do this too! See? Mrs. A. sells nothing! She only wants to help.

What was Alcola? Buried amongst modern references to cities named that, etc, I found a listing selling the pamphlet below. The text is half obscured, but has bold sections about giving it secretly. Just drug your family members without their knowledge or consent! Use coffee or soup to mask the flavor, because mixed in water, they would notice.

Seems our Mrs A. was fronting a quack cure containing who knows what, which you can slip secretly into a soup.