Vital Muscle Vitamin

Vitamin D is most widely recognized to exert bone and immune effects.   PB Tomlinson, from the University of London (United Kingdom), and colleagues completed a meta analysis of published studies of vitamin D and muscle strength in healthy adults (ages 18 to 40 years), covering a total of 310 subjects.  Selected trials lasted from 4 weeks to 6 months and dosages differed from 4000IU per day to 60,000IU per week. Upper and lower limb muscle strength both showed a  standardized mean difference of 0.32, for which h the investigators “[suggest] vitamin D supplementation significantly increased muscle strength.”