ghk-cu receptor downregulation desensitization The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline FIGURE E 9.2.4 Downregulation of
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4) Blood Disorders Certain conditions affecting blood and bone marrow including some leukaemias and myeloproliferative disorders such as polycythaemia vera can cause elevated B12 due to increased production of B12binding proteins by white blood cells

doi:10.1016/j.yrtph.2020.104665

The short answer: Intravenous IV Therapy bypasses the stomach and intestine

Thus, impaired serine synthesis eventually leads to folic acid deficiency
