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Without intrinsic factor, vitamin B12 absorption is significantly impaired, which is why vitamin B12 deficiency is more common in individuals with gastrointestinal disorders that affect intrinsic factor production or absorption

So the nomenclature can get a little bit confusing

Oral versions exist, but injections generally provide better absorption and effectiveness

The vitamins used are generally FDA approved, but injections should be administered by a licensed healthcare professional

Typical standalone TB-500 protocols use 2-5mg weekly, often front-loaded with higher doses initially before tapering to maintenance levels

Weekly dosing is great for those with severe deficiencies or major neurological symptoms