Triethanolamine myristate is a fatty acid salt. It is used in cosmetics as emulsifier and surfactant. It may promote acne. Triethanolamine myristate was tested as gastrointestinal transit delaying agent. The investigations showed that in 4 out of 5 subjects, the gastric residence time of the pH-telemetering capsule could be prolonged and the renal elimination of riboflavin increased. The increase in renal elimination of riboflavin in the presence of triethanolamine myristate was statistically significant. In dogs, a bilayer tablet consisting of triethanolamine myristate and riboflavin resulted in an absolute bioavailability of 2-3 times greater than the bioavailability of riboflavin alone.