What supp?

Flex, July, 2009 by Jim Stoppani

Which one of these unlikely supplements can boost your strength?

ANSWER: B. Vitamin D.

Since vitamin D gets converted in the body to a steroid hormone--1,25-dihydroxyvitamin D--it makes sense that it would have some effect on strength. This active form of vitamin D binds to specific receptors found on membranes and nuclei of muscle cells. When it binds to these receptors, it enhances muscle contraction and protein synthesis--the buildup of muscle protein that leads to muscle growth. Research shows that certain types of these receptors may be responsible for greater muscle size and strength. Adequate vitamin D levels can help ensure your muscle receptors are activated for optimal muscle function, strength and muscle growth.

Take 1,000 international units of vitamin D about twice per day with meals.

--Jim Stoppani, PhD