Silverware (solid or plated) It is believed that the wealthy in history have had better health because they ate off silver utensils. If you have silver plated flatware, it's useless for melt value but can be invaluable for the health benefits. Switch to your "good silver" when society collapses and you may greatly reduce your need for medical attention!
Colloidal Silver(purchased or homemade) This substance has been used for years. (Yes, I remember to guy who turned blue! He abused the use of homemade CS and drank it daily. Everything in moderation!) Whether you stock up on pre-made bottles or have the supplies on hand to DIY, this is an excellent item to add to your medical supplies.