I am confused about all the vit b12 and deficiencies. I was taking a normal multivitamin with vit b12 but the cyanocobalamin kind so my bloods are showing high levels of vit b12 and serum folate. I asked my gp if my body could be storing it but not using it and he said no because my red blood cells would be enlarged and they aren't. I have just watched the video on here and it says because your bloods show you have high levels it doesn't mean your body is utilising it properly. How do you find this out or is it just by trialling with methyl b12 and methylfolate to see if it helps? Also is it dangerous to have high levels in your blood and still take these? I have been getting new symptoms that started with vertigo/dizziness, extreme fatigue, headaches/ migraine, nausea, depression, forgetfulness and brain fog etc and I am trying to work out why. There are so many things that share similar symptoms.