I . The concentrations of vitamin Bls and folate in the serum and folate in the erythrocytes were determined and full blood counts made on a series of Caucasian vegans and omnivore controls. 2 . The blood counts and films were normal in all the vegans and no subject had a haemoglobin concentration below the lower limit of normality. 3. Although within the normal range, male but not female vegans had lower values for erythrocyte counts and higher values for mean corpuscular volume and mean

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... cular haemoglobin than their controls regardless of whether they were taking vitamin B" supplements or not.