how long for vitamin b12 injection to work Does a Shot Last? is the b12 injection good

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The actual injection session is relatively quick and straightforward

You may be at risk if you: Are in the elderly age group Follow a vegetarian or vegan diet Have had stomach or intestinal surgery Suffer from digestive issues like celiac disease or Crohns disease Take acid-lowering medications like PPIs or H2 blockers Take metformin for diabetes Are pregnant or breastfeeding Sources of Vitamin B12 B12 is mainly found in animal-based foods : Meat, poultry, fish (especially liver) Eggs and dairy (milk, cheese, curd, paneer) Fortified cereals and plant-based milk (almond or soy milk) Note: B12 is not naturally found in plant foods , so vegetarians need to ensure they get it from dairy or fortified foods

Many patients begin noticing changes in energy and appetite regulation within weeks

PLoS ONE 9 , e92966 (2014)

2013 Aug;101(2):99-105