I recently stopped taking my (self-prescribed) dose of 1,000 IU Vitamin D3. Before this I was on 2,000. I work all day and rarely leave the house, sometimes for a couple of weeks. I thought I was doing the sane thing.

A good number of months in and I start getting all of the symptoms - lethargy, constipation, stomach and intestinal pain, urinating very frequently and feeling like I had a kidney infection.

Bloods came back all normal, including vitamin D and calcium. My symptoms chime so much with Vitaminosis D (Vitamin D toxicity) that I wonder whether the serum levels are accurate indicators of such toxicity. Vitamin D is stored in fat and the calcium gets deposited in muscles - two possible mechanisms for this.

However, I do not know for sure. Either way I have been scared sh!tless of self-prescribing anything else. No matter how mundane it seems.