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Common causes of B12 deficiency can include: Limited dietary intake (common in strict vegan or vegetarian diets) Pernicious anemia, an autoimmune condition that prevents proper B12 absorption in the stomach Gastrointestinal surgeries that remove part of the stomach or small intestine Age-related declines in stomach acid production Long-term use of certain medications, such as metformin or proton pump inhibitors, which can reduce the bodys ability to properly absorb vitamin B12

Thry, C., Zitvogel, L

Physiol Rev 98:11691203 Yang M, Vousden KH (2016) Serine and one-carbon metabolism in cancer

GHK-Cu is a copper-binding tripeptide complex referenced in scientific literature for its role in cellular signaling, extracellular matrix research, and peptide-metal interaction studies

Below are the highest quality and most bioavailable forms of glutathione: S-Acetyl is the active form of glutathione, making it naturally readily available for the body to use