because they are needed in small amounts than other nutrients
Minerals.
A synthetic form of vitamin K. It is sometimes called vitamin K3.
Vitamins and minerals are only required in the diet in very small amounts (milligrams or micrograms, depending on the vitamin or mineral). Macronutrients on the other hand are needed in gram amounts, for example protein or fat.
Calcium and iron are examples of micronutrients classified as minerals. These essential nutrients are required in small amounts for various bodily functions, including bone health and oxygen transport in the blood. While they are critical for overall health, they differ in their specific roles and sources in the diet.
Micronutrients.
A compound that a person needs to live is called a nutrient or a vitamin. Minerals are also needed for the body to live.
Vitamins
the food which is rich in vitamin and minerals and the food which protects us from diseases are called protective food.
These minerals are called evaporites; sodium chloride is an example.
Sorry to say this, still now I didn't hear about B8 Vitamin, but I have some knowledge regarding Vitamin-B. Here I am giving scientific names for Vitamin-B. Vitamin B1 called as thiamine. Vitamin B2 called as riboflavin. Vitamin B3 called as niacin or niacinamide. Vitamin B5 called as pantothenic acid. Vitamin B6 called as pyridoxine, pyridoxal, or pyridoxamine. Vitamin B7 called as biotin. Vitamin B9 called as folic acid. Vitamin B12 called as cobalamin; commonly cyanocobalamin in vitamin supplements.
called hypervitaminosis or vitamin poisoning
Vitamin C