File:Sudden guts pill.jpg

Summary
Illustration of the sudden guts pill from the [https://starmen.net/merchandise/guides/sfswstrategy.php Mother 2 strategy guide]. Scan originally from Starmen.net, and cropped by me.

So yeah it doesn't really look much like a "pill". In Japan it's called "instant guts", and judging by the name and appearance of the item it's supposed to be instant noodles which boost your guts through the roof not literally, of course