Thiamine (B1), riboflavin (B2), niacin (B3), and pyridoxine (B6) are water soluble vitamins that effect many important biological functions, including metabolism of carbohydrates, fats, and proteins, and maintenance of healthy muscle, skin, eyes, hair, and liver. Because few of us eat completely balanced diets all the time, supplements containing balanced portions of these and many other vitamins may allow us to obtain the recommended amounts of these compounds.

Conditions for the determination of vitamins B1, B2, B3, and B6 in dietary supplements.

Determination of vitamins B1, B2, B3, and B6 in dietary supplements using UV absorbance detection at 260 nm.

Determination of vitamins B1, B2, B3, and B6 in dietary supplements using UV absorbance detection at 290 nm.