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Research shows that 20% to 50% of these patients might not have enough B12
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Studies have shown that at doses high enough to fully saturate intestinal B12 receptors, oral B12 is effective, despite a lack of intrinsic factor
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This usually occurs in individuals with underlying digestive conditions, those who have trouble absorbing all nutrients through digestion, or those with pernicious anemia, which specifically prevents B12 absorption
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