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This article explains why deficiency occurs, how B12 absorption is affected, when intramuscular injections are indicated, and what long-term monitoring after gastric banding should involve

Pins and needles, muscle weakness, recurring headaches, or feeling faint are all potential red flags

or lightheadedness Frequent chest pain Frequent wheezing, particularly with heartburn Unexplained weight loss Nausea or vomiting Stomach pain Kidney disease Ask a doctor or pharmacist before use if you are taking a prescription drug

Pediatr Drugs 22, 473-483 (2020)

BMJ (Online) 349

Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement