After reading through a thread on B12, I decided to try the Bluebonnet B12 oil (5000 mcg). I put a drop under my tongue just before my teatime meal every evening and certainly didn't feel any worse after several days of using it. Further reading made me realise it was probably pointless taking it on its own and I needed other B vitamins for it to work properly. B1 and B2 stuck in my head so next time I was in ASDA I had a look at their vitamins and came across a B complex that looked right for the job so decided to try it. The ingredients of each tablet are: Thiamin (B1) 1.1 mg Riboflavin (B2) 1.4 mg Niacin 16 mg NE Vitamin B6 1.4 mg Folic Acid 200 ug Vitamin B12 2.5 ug Biotin 50 ug Pantothenic acid 6 mg That was on the 27th June I started taking both. I would have been taking the B12 oil for approximately around 10-12 days by this point. On the 4th July (Tuesday) I had an entirely 'normal' day - able to stay up all day, do entirely normal stuff, with normal energy and still be okay at night. I was really excited wondering if I'd finally found something which was making a difference! That night I woke feeling all shivery and sweaty with a temperature and a feeling of general yukkiness. I thought I'd picked up a bug. Next day was the same and after eating a tub of fruity cous cous for tea, I got the distinct impression it had been a bad idea then remembered it had sat in the boot of my daughter's car for a couple of hours before it had made it into my fridge!! By Saturday when I was still feeling really awful and very sick I took 2 laxatives, determined to get rid of whatever was sitting like a lead weight in the pit of my stomach. That helped a little bit but when, on Monday morning, I was still having loose motions (sorry for TMI), having to force every bit of food down and couldn't even get dressed for my brother, Ian, coming to visit me, I started to think something else must be going on. Because I'd really tried to stay up in order to get dressed for him, I came on here to try and wake myself up and the first new post was about B12. Suddenly a light bulb went on! Had I been MAKING myself ill I wondered? I remembered a similar kind of occurrence when I doubled my dose of Vitamin D and after about 10 days, felt really ill. Returning to the normal dose sorted things out. Although I had to give in and go back to bed before Ian arrived, I was in a much more hopeful mood than first thing and he was spared me breaking down in hopeless tears, instead just wiping away a few which escaped as I hugged him, so pleased to see him! My question is - could this be feasible? And also - is it possible for the B12 oil to work on its own or have I picked that bit of info up incorrectly?