Colorectal Cancer connection with Vitamin D

Hello All.  I just got out of my Physiology class and we talked about the connection between Colorectal cancer and Vitamin D and I thought I would share it with you guys.  Our bodies can't process Vitamin D, which is stored in the cells in our skin.  Once sun light (UV rays) react with the Vitamin D it turns it into Vitamin D2.  It then travels to our liver or kidneys (I can't recall which one at the moment) and it turns it into Vitamin D3 which our body can then process.  People that live in higher altitudes have a greater risk of colorectal cancer because they do not get a lot of sunlight.  My professor proceeded to tell us not to run to the tanning beds during the winter for two reasons.  1.  Vitamin D3 stays in our bodies for three months 2.  Skin cancer is worse then colorectal cancer. 

So a lack of Vitamin D can cause a greater risk for colon cancer? Good thing I just bought some caltrate with vit D! I get hardly any sun at all (I'm pale as a ghost and would rather keep my tattoos bright than have a tan) and I can't/don't drink milk or probably anything with a significant amount of vitamin D or calcium at all. I should probably really get on taking those pills.

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Female, 22, Ulcerative colitis (pancolitis) since 1999; GERD; gastritis; osteopenia in hip & lumbar region of spine from long term prednisone use

Current Meds:
Primadophilus Reuteri
40 mg Citalopram (for depression/social anxiety)
125mg Imuran