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Vegans and Vegetarians: B12 is found almost exclusively in animal products, so those on plant-based diets must use fortified foods or supplements Older Adults: reduced stomach acid can decrease B12 absorption from food as we age People with Pernicious Anemia: this autoimmune condition prevents the body from making intrinsic factor, a protein needed for B12 absorption Individuals with Gastrointestinal Conditions: diseases like Crohn's or Celiac disease can impair nutrient absorption Patients Who Have Had Gastric Surgery: procedures like gastric bypass can reduce the body's ability to absorb B12 Certain Medications: drugs such as Metformin and proton pump inhibitors (PPIs) can interfere with B12 absorption Medically-Approved vs
Don't use
Others recommend 5 mL
GHK-Cu occurs naturally in human plasma at approximately 200 ng/mL at age 20, declining to about 80 ng/mL by age 60
Availability of data and materials All data are included in the manuscript
Is 5-Amino-1MQ approved for human use
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