--while those vitamin D levels are within the normal test ranges, there's a LOT of controversy now as to whether those ranges are set considerbly too low.

A number of sources seem to feel that optimal D 25-OH levels should be in the high 2-digit to low 3-digit range. There are a number of studies in Neurotalk's vitamin forum "stickies"--and through Braintalk--that speak to this:

http://www.ncbi.nlm.nih.gov/sites/en...sum&query_hl=2

http://www.ncbi.nlm.nih.gov/sites/en...sum&query_hl=6

http://www.ncbi.nlm.nih.gov/sites/en...RVAbstractPlus

http://www.ncbi.nlm.nih.gov/sites/en...RVAbstractPlus

http://www.ncbi.nlm.nih.gov/sites/en...ubmed_RVDocSum

That cross link to the Braintalk thread has others. The bottom line seems to be that the traditional standard given for vitamin D3 supplementation, 200-400IU/day, is much too low--many of these researchers say that 1000IU-2000IU /day, along with proper calcium/magnesium, should be the standard, and even more may be necessary in special circumstances (such as dark-skinned Muslim women who wear traditional full-body covering in Europe, where there is much less sunlight for direct D3 manufacture).