Forty-two patients with muscular dystrophy were treated with a protein hydrolysate, mineral, and vit. supplemented diet for a period of 4-6 months. In no case was there any objective clinical evidence of improvement of the dystrophic process. Subjective improvement was reported in resistance to infection, sense of well being, and affective tone, and in a few instances improvement in family and school relationships was reported. The present study fails to confirm the previously reported therapeutic efficacy of protein hydrolysate and vit. dietary supplements in the treatment of pseudohypertrophic muscular dystrophy.