Today I was running a lot lower than usual, I was 90 at 9am and took 1.3 units to cover my peanut butter crackers. An hour later I was down to 41, I quickly pounded a regular soda, ate a cookie and had four more crackers. At 11am I was at 78. The only time I was higher than normal was when I shut down my pump to go for a bike ride. While at work I wondered what kind of effect the vitamin may have on my insulin. What I found was an article from the Livestrong website. It doesn't explain to much but hints that multivitamins may effect the amount of insulin that is needed.
My conclusion is that it may have been an odd day, I will pay closer attention to my blood sugar levels tomorrow as well as the response to the amount of insulin I take.