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### What you need to know Treatment of iron deficiency (with or without anaemia) is an area where clinicians can implement updated recommendations on dose and frequency of iron supplementation that can have a clinical benefit for patients and also help mitigate environmental harms from healthcare practices. Production and use of medications represent 12-25% of the greenhouse gas emissions from healthcare, the largest item in the supply chain with respect to carbon footprint.12 An accessible entry point for clinicians to reduce their environmental impact is to focus on optimising prescribing. Iron deficiency is a continuum that starts with iron depletion from the body’s stores, which can progress to anaemia. Iron deficiency affects an estimated 2 billion people and is one of the leading risk factors for disability and death worldwide.3 The British Society of Gastroenterology recently updated its guidelines for management of iron deficiency anaemia.4 Recommendations now include dosi

United kingdomMyles sergeantHarjas kaurBritish society of gastroenterologyPublic policy at mcmaster universityHealth ontario partnerships for environmental actionCanadian coalition for green healthcareBritish societyPublic policyMcmaster universityCanadian coalitionEnvironmental actionHealthcare facilities