False. While potassium is indeed an inorganic salt, vitamins are organic compounds. Vitamins are essential micronutrients that organisms need in small amounts for various metabolic processes. In the context of a nutrient medium, you would typically find inorganic salts like potassium chloride or potassium nitrate, and organic compounds like vitamins may be added separately to provide the necessary organic components for growth and development. So, it's important to distinguish between inorganic salts like potassium and organic compounds like vitamins in a nutrient medium.