Although you may eat plenty of B-12-enriched food, your body may not absorb it or use it efficiently due to aging, alcohol intake, and pollutants from the environment, all of which can take a toll on your body and digestion
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Oral supplements have the lowest bioavailability
[6] [7] These injections are not included in NICE guidelines for weight management, which instead emphasise evidence-based interventions including dietary modification, increased physical activity, behavioural therapy, and in appropriate cases, pharmacological treatments (such as orlistat or semaglutide) or bariatric surgery