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Castle later labeled the essential substance secreted by a normal stomach as intrinsic factor and the substance present in food as extrinsic factor. Subsequent studies showed that the intrinsic factor serves as an intestinal transport vehicle for the extrinsic factor (later identified as vitamin B12) (139)
Experience symptoms of B12 deficiency, such as weakness, tingling in the hands or feet, or brain fog
[14] Are there any side effects of Lipo-B injections
Are you applying it topically, injecting it subcutaneously, or using another method
Instead, include food sources of vitamin B12 in your diet, says Taylor
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