My sister is spondylitis patient unka spinal cord ka operation v ho chuka h 2 sal phle, operation successful v rh but unko hmesha headache and body pain, joint pain hota h. Avi ek week phle unhone apne Dr. se cnslt kiya to unhone bht sare test krwae r blood rprt me aya k unko vit D ki deficiency h atleast35 hona chahye bt meri sis ka 4 hogya h. please suggest something k vit D k level ko kaise normal kiya ja skta h aur unke lye koi aur advice jsse unko relief mile. Thank you.