B12 and Metformin for PCOS

Lisa
http://www.pcosnutrition.com/links/blogs/new-metformin-warning-mandatory-supplementation-with-vitamin-b12.html
So this is kind of an old article but thought I'd share.  I had extreme fatigue and nausea this last week which was my first week of a full 1500 dose of metformin.  I have been taking prenatals but once I read this I added a B12 supplement.  I've felt better the last 2 days.  Just some info for you guys let me know if you have any other insight!  I've only been taking this for 3 weeks now!