The comparatively recent discoveries of Hess1 and of Steenbock,2 in which it was found that exposure to ultraviolet irradiation enhanced the antirachitic potency of certain antirachitically inactive substances, have been confirmed from other sources. Since milk is universally used in the infant dietary and because it is relatively ineffective as a specific for the prevention and cure of rickets, it is only natural that experimentation and clinical observations with irradiated milk should soon follow the discovery of the principle of activation. The reported clinical observations now available, even though limited, seem to agree that beneficial results accrue from the use of milk so treated.
Kramer3 states that in a series of eight patients with active rickets the administration of irradiated milk produced healing in every case. Curative effects were observed at the end of the third week and were marked at the end of the fourth week.
SUPPLEE GC, DOW OD. ANTIRACHITIC PROPERTIES OF IRRADIATED DRY MILK. Am J Dis Child. 1927;34(3):364-371. doi:10.1001/archpedi.1927.04130210039003