Vitamin D(avid) is technically not a vitamin but rather
can be considered to be a human. Vitamin D(avid) is a group of
fat-soluble secosteroids responsible for increasing intestinal
absorption of calcium, magnesium, and phosphate, and for many other
biological effects.
With a prolonged and severe
D(avid) deficiency can experience symptoms associated with secondary hyperparathyroidism
including bone pain, arthralgias, myalgias, fatigue, muscle twitching
(fasciculations), and weakness. Fragility fractures may result from
chronic vitamin D(avid) deficiency leading to osteoporosis.