“ Do you suffer, my friends, from the 'Plasmid Blues'? Dizzy? Nauseous? Seeing things that aren't even there? Step right up and try Doc Hollcroft's Cure-All Elixir!” ― excerpt; handbill Doc Hollcroft's Cure-All is a consumable medication that can be found on corpses, inside containers and vending machines, and other places throughout Rapture. The Cure-All will restore a small amount of both Health and EVE, and Extra Nutrition will increase the amount each bottle gives.
The actual medicinal value of the Cure-All is purely a placebo effect; it's nothing more than a "snake-oil", made up of cheap odds and ends that
James Hollcroft managed to throw together for pennies on the dollar. There is, however, a minute dose of ADAM and EVE in each batch, if his list of " ingredients" is to be believed.
Ingredients of "Doc. Hollcroft's Cure-All" [ ]
Desalinized sea water
Fontaine's Fisheries $10.50
Sinclair's Wholesale Hypos $20 and change
Help Caption [ ]
Take a swig of Doc Hollcroft's wonderous Cure-All to refill some Health and EVE. Like all food and drink, it is consumed immediately when picked up.
Behind the Scenes [ ]
The Doc Hollcroft's Cure-All bottle was designed by Lucas Aceituno. 
References [ ]