It might but... I searched & found sites claiming lack of lunula indicate B12 deficiency but have found no objective evidence to support this- it may be true for some but there is no proof. Others say it means hypothyroidism or poor circulation. I don't think anyone knows for sure! See http://www. Healingwell. Com/community/default. Aspx? F=30&m=1630799 & http://www. Normanallan. Com/med/askdr/finger. Html#moons.