i don't know--just take them when i remember to.....

I have that problem they have me on 1000 IU of vitamin D for it daily

I heard somewhere that it should be taken just after a meal to help with absorption. Wonder if it is true or not.

try doubling the amount.........read that!!

It has been determined that many MS people have problems absorbing vitamin D properly.
MS people should have a blood test to determine Vitamin D -25(OH)D level twice a year: in mid April and mid October. Depending the test result one should adjust the supplementation level for next 6 months. Because I cannot attach pictures to posts or enter the table here, I will send you the picture of the table by message.