Vitamin B₆ differs from the other water-soluble vitamins because:

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Vitamin B₆ is the only water-soluble vitamin that can be stored in the body, particularly in muscle tissue. The other water-soluble vitamins (B₁, B₂, B₃, B₅, B₇, B₉, B₁₂, and vitamin C) cannot be stored in large amounts and must be replenished daily from the diet. Unlike other water-soluble vitamins, such as vitamin C and the B-complex vitamins, vitamin B6 can be stored in the body in small amounts. However, excessive intake of vitamin B6 can lead to toxicity, so it is important to not exceed the tolerable upper intake level (UL) of 100 mg/day for adults. Vitamin B6 plays a role in the metabolism of amino acids and the production of neurotransmitters, but not in the metabolism of energy-yielding nutrients. Vitamin B6 is also found in a variety of plant and animal foods, not just animal foods.

Vitamin B₆ Differs from the Other Water-Soluble Vitamins Because