the reason for that is that a few months ago a blood test showed that i am deficient at b12.
the clinics here dont test more b vitamins regularly the doctor just perscribed me b12 under tonugh pill.
it didnt afeect realy on my lips.
after reading more on the net i realised that almost always when a person have b12 deficient it means the other b's are also most likely be deficient.and more is that also my face is seboreic which on wikipedia when i red on as far as i remember b2 and biotin it was written that deficient in them is causing this seborea dermetitits or what it called like.
the b vitamins are working with Synergy toghter,so they all need to be in enough amount -maybe that is why now it affect me where as when i took only b12 it didnt.