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วันศุกร์ที่ 28 สิงหาคม พ.ศ. 2552

Deficiency and Toxicity of Riboflavin (B2)

Deficiency

• May result in itching and burning eyes; cracks and sores in the mouth & lips; bloodshot eyes; purplish tongue; dermatitis; retarded growth; digestive disturbances; trembling; sluggishness; oily skin.
• Deficiency of the vitamin can occur in the elderly subsisting on tea or coffee, toast and cookies.
• Riboflavin deficiency also occurs in those with chronic liver disease, chronic alcoholics and those who receive total parenteral nutrition (TPN) with inadequate riboflavin.
• Marginal riboflavin deficiency, in the context of nucleoside analog antiretroviral therapy, has been known to cause severe lactic acidosis.

Toxicity

There is no known toxicity to riboflavin. Because riboflavin is a water-soluble vitamin, excess amounts are easily excreted by the body in the urine.

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