Vitamin B1 (Thiamine), Vitamin B2 (Folic Acid), Vitamin B3 (Niacin), Vitamin B12 (Cyanide), Vitamin B12 (Cyanocobalamin), Vitamin B6 (Pyridoxine), Vitamin B9 (Folic Acid), Vitamin B12, Cyanocobalamin, etc., are essential nutrients for human metabolism.

1. Vitamin B1 (Thiamine): Main sources include brown rice, animal liver, animal kidney, pork, beans, fresh vegetables, and nuts, deficiency can cause beriberi and lactic acid accumulation.

2. Vitamin B2 (Riboflavin): Widely present in the liver, kidney, heart, egg yolk, eel, milk, etc., of various animals, and some content is also found in green beans and soy products, as it does not accumulate in the body, it needs to be supplemented from the diet every day, and deficiency may manifest as inflammation of the mouth, eyes, and reproductive organs, such as cheilitis, glossitis, and conjunctivitis.

3. Vitamin B3 (Niacin): High in animal liver, kidney, milk, eggs, and fresh vegetables, deficiency can cause pellagra, also known as糙皮病, mainly manifested as dermatitis, diarrhea, and neurodegenerative diseases.

4. Vitamin B5 (Pantothenic Acid): Widely present in various animal organs, beef, pork, and unrefined grains, etc., deficiency may result in abnormality of the limbs’ nerves, mainly manifested as numbness of the toes, burning sensation, pain, and unsteady walking.

5. Vitamin B6 (Pyridoxine): Widely available in food sources such as yeast powder, fish, potatoes, sweet potatoes, etc., and can be used to prevent atherosclerosis, hair loss, high cholesterol, and nausea during pregnancy.

6. Vitamin B7 (Biotin): Biotin is present in foods such as milk, egg yolk, animal kidneys, strawberries, etc., and deficiency may cause symptoms such as hair loss, weight loss, and dermatitis.

7. Vitamin B9 (Folic Acid): Widely distributed in green leafy vegetables such as spinach and beetroot; animal foods such as liver, kidney, egg yolk, and fruits such as oranges and kiwi; the deficiency of vitamin B9 is mainly related to diseases such as neural tube defects, megaloblastic anemia, cleft lip and palate, etc.

8. Vitamin B12 (Cyanocobalamin): Mainly from animal liver, kidney, pork, etc., deficiency may cause symptoms such as pernicious anemia, irregular menstruation, nausea, and loss of appetite.

Vitamin B complex has various characteristics, sources, and common functions, playing an indispensable role in maintaining health. If a patient has a deficiency of vitamin B and there is no improvement after food supplementation, they should go to the hospital for a check-up and take vitamin B tablets or multivitamin tablets under the guidance of a doctor.