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These immune responses cause the release of chemicals, such as histamine, that trigger symptoms such as itching, redness, rashes, runny nose, swelling, and, in severe cases, anaphylaxis (a life-threatening reaction), leading to serious symptoms such as difficulty breathing

Taking up to 25 micrograms of vitamin B12 supplements per day is usually safe and unlikely to cause you any harm

Whether it manifests as a sudden, sharp pain or a persistent ache, hand cramps can disrupt daily activities and diminish overall quality of life

Other groups who may benefit include: Patients following gastric surgery (gastrectomy, bariatric procedures) where intrinsic factor production or absorption sites are compromised Individuals with malabsorption disorders such as Crohn's disease, coeliac disease, or chronic pancreatitis Strict vegans and vegetarians with dietary insufficiency, though oral supplementation is usually tried first Elderly patients with atrophic gastritis or reduced gastric acid production Patients on long-term metformin or proton pump inhibitors, which can impair B12 absorption Individuals with nitrous oxide exposure (recreational or medical), which can cause functional B12 deficiency Diagnosis typically involves serum B12 measurement, with levels below approximately 148 pmol/L (though thresholds vary between laboratories) generally indicating deficiency