An iron supplementation product, iron albumin succinylate, was given t
o rats p.o. for 26 wk at doses of 0, 300, 670 and 1500 mg/kg/d. The co
ncentration of the major groups of organisms was determined in faecal
samples using selective and non-selective agars. No significant differ
ences were detected in viable counts of the main microbial groups, ind
icating that the compound is unlikely to grossly affect the intestinal
microflora.