Vitamin D levels won't go up! in Sclero Forums (MAIN) Posted August 23, 2009 My vitamin D is also low. I was taking just vitamin d supplements for a few months and was retested and found to be low yet again. I was then told that I need to also take a calcium supplement as you need this to help absorb the vitamin D so I now take the vitamin D, a calcium pill with vitamin D and a multivitamin that also contains vitamin D every day! I hope next time it will be up! Plus I am very tan so I know I am getting what I can from the sun!