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The Lancet Shah R, et al

A study found, Parenteral vitamin B12 is more effective than oral supplementation in patients with severe deficiency or malabsorption. In summary, B12 injections are essential for treating many health conditions and absorption problems

Thus, it appears possible to divorce nausea from satiation in mice treated with GLP-1R agonists by discovery of GLP-1R agonists that preferentially access and activate the NTS but not the AP

Systemic effects remain less certain because peptides are generally broken down during digestion, which reduces the amount that reaches circulation in active form

Cruz MR, Graham CE, Gagliano BC, Lorenz MC, Garsin DA

Interestingly, the authors show that IgG mediates macrophage infiltration in adipose tissue and that IgG can engage the insulin receptor via its CH3 domains, thereby reducing signaling in response to insulin