What Does It Do?
B2 is vital for protein and carbohydrate metabolism. Riboflavin is a precursor to two coenzymes. Coenzymes are molecules that carry chemical compounds between two enzymes which transport many substances in the body. Being a precursor simply means that the equine body uses B2 to make the coenzymes. B2 also appears to have a role in fat metabolism.
There is a specific site in an area of the small intestine where dietary B2 is absorbed. It binds to a carrier protein and then is transported to the liver, the adrenals, and other sites where it is built into the enzymes.
As with all water soluble vitamins excess B2 is withdrawn by the kidneys and excreted via the urine.
The Equine Nutrition Nerd 
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