Intervention With Vitamin D and Omega-3 Supplements and Incident Heart Failure

Inclusion Criteria: * Men aged 50 or older or women aged 55 or older * Be consuming no more than 800 IU of vitamin D from all supplemental sources combined (individual vitamin D supplements, calcium+vitamin D supplements, medications with vitamin D \[e.g., Fosamax Plus D\], and multivitamins), or, if taking, willing to decrease or forego such use during the trial; * Be consuming no more than 1200 mg/d of calcium from all supplemental sources combined, or, if taking, willing to decrease or forego such use during the trial; * Not be taking fish oil supplements, or, if taking, willing to forego their use during the trial Exclusion Criteria: * prevalent heart failure * History of cancer (except non-melanoma skin cancer), heart attack, stroke, transient ischemic attack, angina pectoris, CABG, or PCI * History of renal failure or dialysis, hypercalcemia, hypo- or hyperparathyroidism, severe liver disease (cirrhosis), or sarcoidosis or other granulomatous diseases such as active chronic tuberculosis or Wegener's granulomatosis; * Allergy to fish or soy