Micronized trans-resveratrol is provided in 50-200 mg unit dosage form for use as a single unit dose daily for administration to human patients the treatment or prevention of non-alcoholic fatty liver disease and/or for the treatment, prevention or reversal of non-alcoholic hepatic steatosis, e.g. for administration to patients exhibiting evidence of fatty liver on ultrasonography. A reported study shows the effects of resveratrol micronized formulation in reducing the liver fat, decreasing hepatic enzymes, serum glutamate pyruvic transaminase (SGPT) and gamma-glutamyl transpeptidase (g-GT) and decreasing insulin resistance. At the end of the study, statistical analysis showed a strongly statistically significant reduction in the liver fat, which in some patients continued for an extended period after treatment was discontinued. These results demonstrate that use of resveratrol in micronized formulation improves features of NAFLD, prevents liver damage and that resveratrol micronized formulation can be an effective treatment for NAFLD.