Without seeing your nail, I can not comment on a "vitamin deficiency." I would expect that if you had such a deficiency, then all your nails would be affected. As far as why the nail came off so easily there could be several reasons. If the nail was already loose (from a fungal infection for example) it would come off easier. If it was a normal nail before the incident, then it may have just been the angle that it got hit. When the nail regrows it can take up to 1 year to fully grow out. If you are concerned, I recommend you see a podiatrist for further evaluation.
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