Abstract: A method of administering beta-hydroxy-beta-methylbutyric acid (HMB) is described, and specifically administering HMB-acid to a person such that the administration of free acid HMB results in an increase in effectiveness of HMB over administration of other forms of HMB, including a calcium salt HMB composition is described. Administration of HMB-acid results in an increase in the peak level of HMB in plasma compared with administration of a similar dose of a calcium salt HMB composition. Administration of HMB-acid results in a faster time to reach peak plasma levels of HMB relative to administration of a similar dosage of a calcium salt HMB composition.

Abstract: The present invention provides a composition comprising HMB and Vitamin D. Methods of administering HMB and Vitamin D to an animal are also described. Vitamin D and HMB are administered to increase muscle mass, strength, and functionality. The combination of Vitamin D and HMB together has a synergistic effect, which results in a surprising and unexpected level of improvement in muscle mass, strength and functionality.