I was in the low range for serological vitamin B12 at 275 pg/mL three months ago. Since then I've been taking oral and sublingual B12 supplements. I just got my serum B12 levels rechecked today and they're now much higher at 1449 pg/mL.
The reason I got it rechecked is because I've been having widespread itching (without rash) and neuropathy (burning/tingling/prickly sensations mostly in my limbs) for the last month. I'd figured that maybe it was because I was deficient in B12 or not absorbing the supplements correctly, but now I wonder if it's perhaps due to having too much B12.
Does anyone know if too much B12 can cause itching and other sensations? I've had a number of other blood and imaging (MRI and CT scan) tests done recently and none of them have indicated suggested any abnormalities.
Thanks for any feedback.