Vitamin B2, Vitamin B12, also known as cobalamin, is essential for red blood cell formation, nervous system function, and DNA synthesis. It is found almost exclusively in animal-based foods such as meat, fish, eggs, and dairy products, making supplementation or fortified foods necessary for vegans. A deficiency in vitamin B12 can lead to anemia, fatigue, concentration problems, and nerve damage. Since it can be stored in the body, deficiency symptoms often appear only after a long period. Adequate intake is especially important for older adults and pregnant women.also known as riboflavin, is essential for energy metabolism and cell function. It helps convert nutrients into energy and supports the health of the skin, eyes, and nervous system. Good sources of riboflavin include dairy products, eggs, almonds, leafy green vegetables, and fish. A deficiency can cause skin inflammation, cracked lips, and vision problems. Since it is water-soluble, it must be consumed regularly through food, as the body cannot store it.