Task: Answer Verification
Input (English): Question: Is combined calcium and vitamin D supplementation superior to calcium supplementation alone in improving disturbed bone metabolism in patients with congestive heart failure?
Answer: A vitamin D3 supplement of 50 microg/day has no additional beneficial effects on markers of bone metabolism in CHF patients with low initial 25-hydroxyvitamin D concentrations if an adequate daily calcium intake is guaranteed.
Output (English): no