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Together, the group of B vitamins is referred to as vitamin B complex. These water-soluble vitamins are critical to cell metabolism. The B vitamins play several important roles in the body, including: 1  Promoting cell growth and division. 2  Maintaining healthy skin and muscle tone.
What Is the Primary Role of B-Complex Vitamins? The B vitamin family is rather large. B-complex vitamins include B-1,B-2, B-3, B-5, B-6, B-7, B-9 and B-12. The fact that they are water-soluble means they should be replenished regularly as any excess of these vitamins are excreted in urine.