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Deficiency is particularly common in elderly people, because the ability to absorb vitamin B12 can decrease with age ( Other people at risk of deficiency include those who have had intestinal surgery, including weight loss surgery
But alternatives exist for specific situations
The GCGR component is particularly important for researchers studying energy expenditure rather than just appetite suppression
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DOI: 10.1016/j.bcp.2018.05.003
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