Park et al., 2020
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Immunogenicity risk assessment of synthetic peptide drugs and their impurities
Inadequate secretion of intrinsic factor, resulting from lesions that destroy the gastric mucosa (which can be caused by ingestion of corrosives, extensive tumors, and conditions associated with gastric atrophy, such as multiple sclerosis, certain endocrine disorders, iron deficiency, and subtotal gastrectomy) Structural lesions leading to vitamin B 12 deficiency, including regional ileitis, ileal reactions, and malignancies Competition for vitamin B 12 by intestinal parasites or bacteria
This means it is not expected to cause the common side effects of hGH like insulin resistance, carpal tunnel syndrome, or potential promotion of cancer cell growth