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The Homocysteine Connection But there's another important piece to this puzzle: an amino acid called homocysteine

Vitamin B12 deficiency can occur due to dietary restrictions (vegetarian or vegan diets), absorption issues (pernicious anemia or gut disorders like celiac disease or Crohns disease), age-related changes in elderly patients, or long-term use of certain medicines

[31] Are pediatric doses the same as adult doses

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But if you just want the fast answer, most research shows GHK-Cu to be the more broadly studied copper peptide for both hair and skin