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The nasal epithelium is more permeable than the gut, which is why intranasal delivery is used clinically for peptides like desmopressin (1-deamino-8-D-arginine vasopressin) and calcitonin
But the force of the water stream hitting the delicate freeze-dried structure creates foaming, introduces air into the solution, and generates mechanical stress that can denature the peptide
Anyone can develop a vitamin B12 deficiency
Plus our Multiple-Injection pack is more affordable than buying the same in single drips
Oral formulations are mainly discussed for gastrointestinal applications, but research remains limited
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