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Seven patients with active rheumatoid arthritis excreted significantly less pyridoxine in the urine than controls when patient‐control pairs were fed identical constant diets while receiving no drugs. After a 10 mg. dose of pyridoxine hydrochloride, change in objectively measured stiffness appeared to be inversely related to change in urinary excretion of pyridoxine. The study does not necessarily show that giving rheumatoid arthritics pyridoxine is beneficial.
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McKusick et al. (1964) studied this question.
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