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Limitations include small sample sizes, lack of large multi-center trials, all studies from Eastern Europe or Asia
If you and your provider decide that vitamin b12 injectable for humans is right for you, knowing what to expect can be helpful
Vegans are also at risk since B12 is only found in animal products
Fortunately, there is increasing evidence that oral B12 supplements are just as good as injections for raising blood levels in most people ( Vegetarians and vegans are usually advised to take at least 10 mcg per day, or at least 2,000 mcg once per week ( However, some doctors still prefer the use of injections
Blood 94 , 14181428 (1999)
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