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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.
Photos: Pond5. Referred to as vitamin B complex, the eight B vitamins â B1, B2, B3, B5, B6, B7, B9, B12 â play an important role in keeping our bodies running like well-oiled machines. These essential nutrients help convert our food into fuel, allowing us to stay energized throughout the day.hotos: Pond5. Referred to as vitamin B complex, the eight B vitamins â B1, B2, B3, B5, B6, B7, B9, B12 â play an important role in keeping our bodies running like well-oiled machines. These essential nutrients help convert our food into fuel, allowing us to stay energized throughout the day.