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It relies on a protein called intrinsic factor in your stomach to be absorbed

Expertise in Peptide Synthesis Extensive Experience: Years of expertise in synthetic peptide development

Peptides do so many thingsincluding regulating cell replication and deaththat impact cancer risk, says Jennifer Manne-Goehler, MD, a physician at Mass General Brigham and an assistant professor of medicine at Harvard Medical School

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But if the deficiency is in high levels, Vitamin B-12 injections are suggested as an ultimate measure

Injectable GHK-Cu has no published human clinical trials