UK obesity guidance including NICE CG189 (Obesity: identification, assessment and management) and NICE PH53 (Weight management: lifestyle services for overweight or obese adults) does not recommend vitamin B12 supplementation as a weight management intervention
What I want patients and clinicians to take away from this is that if you or your patient has obesity, established cardiovascular disease, type 2 diabetes, CKD, HFpEF, MASH, or sleep apnea, this drug class should be a serious part of the treatment conversation
This matters enormously for peptide research

Red flag symptoms requiring urgent assessment: Severe, persistent vomiting Inability to tolerate oral intake for more than 24 hours, suggesting possible gastroparesis or other complications Signs of dehydration Decreased urine output, dizziness, dry mucous membranes, or tachycardia Severe abdominal pain Particularly if acute, localized, or associated with fever, which may indicate pancreatitis or other acute abdominal pathology Right upper quadrant pain, fever, or jaundice Suggesting possible gallbladder disease Severe abdominal distension with inability to pass stool or gas Potential bowel obstruction or ileus Hematemesis or melena Suggesting gastrointestinal bleeding Progressive dysphagia Difficulty swallowing that worsens over time Situations requiring routine consultation: Patients should contact their healthcare provider for non-urgent evaluation when experiencing persistent nausea or vomiting lasting beyond 2-3 weeks at a stable dose, as this may indicate inadequate adaptation or the need for dose adjustment
