All of the peanut plant is usable.
Peanuts contain thiamine and riboflavin and next to yeast, are the richest source of nicotinamide.
The skins are high in B-complex vitamins. The runner is considered by commercial users to be a specific peanut type. Special breeding programs have resulted in many intermediate growth habits and types. Runner types are used primarily for peanut butter and salting. Spanish types are used chiefly for confections while the Virginia type is used for salting, confections, and roasting in shell.