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Certain populations, including older adults and people following a vegan diet, are at a higher risk of vitamin B12 deficiencies and may benefit from taking a vitamin B12 supplement
It's estimated that between 10 percent and 30 percent of people older than 50 produce too little stomach acid to release B12 from its carrier protein in foods
For others, it takes a couple of injections
Another study found that men who took vitamin B6 and B12 supplements were more likely to get lung cancer especially if they smoked
The dosage depends on the ingredients in the injection
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