While potassium is represented by a "K" on the periodic table, it is not the same thing as vitamin K, says food consultant Jessica Bruso. Potassium is a mineral, while vitamin K is a vitamin.
Potassium is important for the proper functioning of the heart, kidneys and other organs, explains WebMD. Those who have potassium deficiencies usually smoke, overindulge in alcohol, take diuretics, or have physically challenging careers.
Vitamin K helps the blood clot, and people should not take it without professional advice, says WebMD. Vitamin K deficiencies can lead to unrestrained bleeding; however, this condition is rare. Vitamin K is common in foods such as eggs, strawberries, beans, broccoli, spinach and some meats.