do b12 injections cause constipation Vitamin B12: What Are the Health Benefits? Low Vitamin B12? Diet vs.

it is this combination of compounds that is absorbed further down in the intestines, in a portion called the ileum

That said, the choice isn't always obvious

1000 g daily) may be able to produce adequate absorption of vitamin B 12 even in the presence of intrinsic factor deficiency, and therefore may be an alternative to the intramuscular route for many people

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The piriformis muscle can cause problems when spasm of the muscle irritates one of the large nerves innervating the leg, the sciatic nerve