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Many people, including those over 50, on PPIs or metformin, or with GI conditions, produce insufficient intrinsic factor
But unless your healthcare provider has told you otherwise, youre probably not lacking in the vitamin, as most Americans do not have a deficiency (Langan, 2017)
Because B12 is primarily found in animal-based products, vegetarians and vegans are particularly susceptible to B12 deficiencies
Standard concentration: 0.5 mg/mL This is a common concentration used by many compounding pharmacies
No published trials have reported alterations in methylation pathway markers (like homocysteine or methylmalonic acid), but this has not been systematically studied in long-term human use
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