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Several examples have also now emerged suggesting the GH/IGF-1 signaling pathway is relevant to human aging 12 , including the discovery of functional mutations in the IGF-1R gene in individuals with exceptional longevity, resulting in relative IGF-1 resistance 13,14 , and in subjects lacking functional GH receptors (Laron dwarfs) 15

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In the duodenum, digestive enzymes release vitamin B12 from haptocorrin, allowing it to bind with intrinsic factor, a transport protein secreted by the stomach's parietal cells

Regular blood tests can also help check your B12 levels