My daughter is suffering with what we think is chilblains, the GP sent her for bloods and it came back she had high b12, everything else was good and within range. We stopped her multivitamin and retested 6 weeks later, he B12 actually increased slightly. No one can really explain why this is but we are worried because of what we have read online and wondering if anyone can shed any light or experience. Research seems very limited on this.