Fluoride supplementation recommendations.
 Age  < .3 ppm F .3-.6 ppm F >.6 ppm F
 0-6 mo  0 0 0
 6m-3y  .25 mg 0 0
 3y-6y  .5 mg .25 mg 0
 6y-16y  1 g .5 mg 0

Undiagnosed vitamin D deficiency is not uncommon, and 25-hydroxyvitamin D is the barometer for vitamin D status. Although there is no consensus on optimal levels of 25-hydroxyvitamin D as measured in serum, vitamin D deficiency is defined by most experts as a 25-hydroxyvitamin D level of <20 ng/mL (50 nmol/L). REF

Vitamin D for who and how much ? DRI for vitamin D in women ? REF

What is the answer to this Q?: Prednisone long term tx should be supplemented with what ? REF

Best test for Vit D deficiency ? REF

USPSTF recommends re multivitamin supplements in the geriatric age group: REF

Long-term histamine H -blocker or proton pump inhibitor use is associated with decreased absorption of calcium carbonate. Patients taking these medications who require calcium supplementation should use calcium citrate to improve absorption. Calcium carbonate preparations should be given with a meal to improve absorption. Vitamin D is important in calcium absorption. REF

Since an acidic environment increases iron absorption, ascorbic acid (vitamin C) can enhance absorption of an iron supplement. REF

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Is beta-carotene and vit E supplementation helpful in Alz ? This article doesn't ans the Q but mentions the topic. REF