People who do not have adequate amounts of vitamin D develop weakness of leg and arm muscles. This study will determine if vitamin D supplementation benefits muscle functions important for swallowing, bladder and bowel function.

Inclusion Criteria:

• Patients who present for evaluation to the UW Geriatric clinic including Dr. Pryzbelski's subspecialty, or Osteoporosis clinics
• Age 70 years or older
• Cognitively intact, as determined by the attending physicians at above mentioned clinics

Exclusion Criteria:

• History of, on ongoing, renal failure
• History of liver failure
• Known malabsorption
• Known disorders of parathyroid function, hyper/hypocalcemia, or other abnormalities of calcium or phosphate metabolism
• Known history of vitamin D intoxication or granulomatous disease
• active seizure disorder
• Pain associated with temporomandibular joint (TMJ)