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Intrinsic factor is only made in the stomach and after a gastrectomy there is little to no more of it or gastric acid, and the active mechanism in the body where B12 is absorbed is either less available or not available at all depending on if the surgery was a total or a part of a gastrectomy
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A typical approach is 4 to 12 weeks on, then an off-cycle of equivalent length
The 191aa sequence is considered the gold standard for HGH research due to its full biological activity and low risk of immunogenic response compared to 192aa analogs
The risk appears higher with repeated infusions and in patients with pre-existing risk factors
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