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An absence of intrinsic factor is the most common cause of pernicious anemia

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In addition to supplements, you can support your body's natural production of healthy glutathione levels by putting sulfur-rich foods like spinach, avocados, asparagus, and broccoli on the menu

What is the main takeaway from this comparison

doi: 10.1210/en.2014-1862 89 UenoyamaYInoueNNakamuraSTsukamuraH