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It can be obtained through food sources such as fatty fish, egg yolks, and mushrooms, but many people do not get enough vitamin D through their diet alone
Tiredness is common, but it is not specific to B12 deficiency, so testing may be needed
Older individuals: Aging leads to decreased gastric acid production, reducing B-12 release from bound proteins
You might consider a B12 shot if you follow a vegetarian or vegan diet, since B12 comes mainly from animal foods
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