what are the effects of low vitamin d3?
['Getting Sick or Infected Often. Share on Pinterest. ... ', 'Fatigue and Tiredness. Feeling tired can have many causes, and vitamin D deficiency may be one of them. ... ', 'Bone and Back Pain. ... ', 'Depression. ... ', 'Impaired Wound Healing. ... ', 'Bone Loss. ... ', 'Hair Loss. ... ', 'Muscle Pain.']