Does vitamin D improve muscle strength in adults?
Daily supplementation with 25 or 10 μg vitamin D3 for 16 weeks did not improve muscle strength or power measured by the jump test, handgrip test, or chair-rising test in this population with low baseline vitamin D status.
Medical skepticism may be a risk factor for early death. That effect may be mediated through higher rates of unhealthy behavior among the medically skeptical. Further studies using more reliable measures are needed.