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When 8 normal women were maintained on an intake of 500 μg of thiamine per 1,000 Cal. the average daily urinary excretions of thiamine ranged from 100 to 276 μg. When the thiamine intake was reduced to 300 μg of thiamine per 1,000 Cal. the average daily urinary excretions of thiamine ranged from 34 to 109 μg. The thiamine excretion expressed as per cent of thiamine intake ranged from 10.0 to 27.6 for the higher intake period and from 5.7 to 18.2 for the lower intake period. Urinary thiamine excretions expressed in terms of micrograms of thiamine per gram of urinary creatinine ranged from 80 to 276 for the first period, and from 26 to 107 for the second period of intake.