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Most people get enough vitamin B12 in their diet, but a deficiency may occur in certain health conditions (e.g., poor nutrition, stomach/intestinal problems, infection, cancer)

Discuss baseline B12 testing with your healthcare provider to determine your personalized supplementation needs

PMID 29543316

Red flags: Vendors making health claims, guaranteeing results, or operating unprofessionally raise both regulatory and quality concerns

Seek urgent medical attention (via NHS 111 or 999 in an emergency) if you experience severe or persistent abdominal pain, persistent vomiting, signs of dehydration (such as dizziness, reduced urination, or extreme thirst), or symptoms suggestive of low blood sugar (such as shakiness, sweating, or confusion)