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Sapropterin is a specific form of tetrahydrobiopterin that is sold under a variety of brand names including Kuvan.

It helps to activate phenylalanine hydroxylase, the enzyme that breaks down phenylalanine in the body.

It is used to reduce blood phenylalanine levels in certain patients with phenylketonuria. It is used along with a diet that is low in phenylalanine.

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