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The injection delivers B12 directly into the bloodstream, making it the most reliable method for patients with absorption problems, pernicious anaemia, or gastrointestinal conditions affecting B12 uptake (such as Crohn's disease, coeliac disease, or following gastric surgery)

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A controlled trial of intermittent oral acetylcysteine in the long-term treatment of chronic bronchitis

This fits the science: BPC-157 uses signaling pathways that stop responding once they reach a certain level

Nature 604:697707 Duan K, Premi E, Pilotto A, Cristillo V, Benussi A, Libri I, Giunta M, Bockholt HJ, Liu J, Campora R, Pezzini A, Gasparotti R, Magoni M, Padovani A, Calhoun VD (2021) Alterations of frontal-temporal gray matter volume associate with clinical measures of older adults with Covid-19