Vitamin B complex is a group of eight essential water-soluble vitamins that work together to support various bodily functions, including energy production, nervous system health, and cell metabolism. These vitamins are not stored in the body and need to be replenished daily through diet or supplements. 
Key components of Vitamin B complex:
Thiamin (B1): Essential for carbohydrate metabolism and nerve function, Healthline says. 
Riboflavin (B2): Involved in energy production, cell growth, and antioxidant activity. 
Niacin (B3): Supports cellular signaling, metabolism, and DNA production and repair. 
Pantothenic Acid (B5): Crucial for fat and carbohydrate metabolism, hormone synthesis, and cell growth. 
Pyridoxine (B6): Important for amino acid metabolism, red blood cell formation, and neurotransmitter synthesis. 
Biotin (B7): Plays a role in fat, carbohydrate, and protein metabolism. 
Folate (B9): Essential for cell growth, DNA synthesis, and preventing birth defects. 
Cobalamin (B12): Necessary for nerve function, DNA synthesis, and red blood cell formation. 
Functions of Vitamin B Complex:
Energy Production:
B vitamins act as coenzymes, assisting in the conversion of food into usable energy. 
Nervous System Support:
They play a vital role in maintaining the health and function of the nervous system, including nerve impulse transmission. 
Cellular Metabolism:
B vitamins are involved in various metabolic pathways, including those for protein, carbohydrate, and lipid metabolism. 
Red Blood Cell Formation:
Some B vitamins, like B6 and B12, are crucial for the production of healthy red blood cells, which carry oxygen throughout the body. 
Other Functions:
B vitamins also support heart health, mental performance, psychological functions, hormone regulation, and immune function. 
Deficiency:
Deficiencies in B vitamins can lead to various health issues, including fatigue, anemia, nerve damage, and skin problems. People at higher risk of deficiency include older adults, pregnant women, and those following strict plant-based diets. 
Supplementation:
B complex supplements are available and can be helpful for individuals who may not be getting enough B vitamins through their diet. However, it's always best to consult with a healthcare professional before starting any new supplement regimen.