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The FDA cited the lack of human studies on the peptide and concerns about safety as its rationale

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For instance, the association of cationic lipids with EV membranes can enhance cellular uptake efficiency (Nakase and Futaki, 2015), while transferrin-conjugated superparamagnetic particles can endow EVs with magnetic responsiveness for imaging-guided therapy (Neubert and Glumm, 2016

It is derived from a protein in the stomach and is purported to help healing of various tissues, including muscles, tendons, ligaments, cartilage, and even the gut

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This dual mechanism is why tirzepatide consistently outperforms single-target GLP-1 medications like semaglutide in head-to-head comparisons