At the beginning of January I started getting painful red patches of skin at the corner of my mouth that were painful when I opened my mouth. Dr Google told me this could well be caused by a vitamin B deficiency. That fitted with the slightly swollen tongue I had at the same time though I didn't notice any other symptoms. So I stocked up on vitamins and for 2.5 weeks took a multivitamin (100% RDA of vitamin B) plus 2 vitamin B complex pills (each 100% RDA). The mouth cracks cleared up within a couple of days. So after 2.5 weeks I cut back to the multivitamin plus one B complex pill, and all was still well - I did that for a week. Then yesterday I decided to cut down to just the multivitamin (so still 100% RDA) and today I woke up and the painful skin at the corners of my mouth is back.
I don't understand how I can be deficient while I'm still taking 100% RDA in tablet form plus I should be getting sufficient from my diet anyway. I'm veggie, but eat dairy, eggs, seeds, varied fruit and veg, all wholewheat bread/pasta/rice as well as vitamin fortified cereal. I don't have any other symptoms other than feeling a bit tired, but I put that down to it being January.
Does anyone have any ideas why this might be happening? Is it something I should go to the doctor for or just up the supplement level again? If I do go to the docs, should I stop the supplements first in case they want to do tests?