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Description
Here, we report a case of systemic contact dermatitis arising from the cobalt in methylcobalamin, characterized by palmoplantar eczema with histopathological T-cell lymphomatoid reaction.A 59-year-old Japanese female [...]

Minor soreness or swelling at the injection site is common and usually resolves within a few days
Conclusion: Sublingual and oral B12 supplementation appear to be as effective as intramuscular (IM) injections in improving cobalamin status and reducing homocysteine levels

Medical conditions require medical care from qualified healthcare providers

Leaving a vial out on the lab bench overnight could render it significantly less potent, if not entirely inert, by morning
