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Serious life-threatening allergic reactions including death have happened in people who have received vitamin B12 by injection or by intravenous (IV) infusion (parenteral)

In Japan and Malaysia, you can even get your B12 shots in supermarkets

Respiratory Tissue Repair and Protection COPD fibroblast restoration occurs at 10 nanomolar concentration, restoring lung fibroblasts ability to contract and restructure collagen while elevating integrin beta 1 expression

Many transplant patients use copper peptides to enhance healing and maximize graft survival

The best result was a modest 2.6 kilograms in a short trial, and that result did not hold up in the larger, longer study designed to confirm it