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Description
14 Important differential diagnoses to consider include medication side effects (eg, methotrexate, chemotherapy, or antibiotics such as trimethoprim), and malabsorption due to an anatomic or autoimmune cause (pernicious anemia), as well as a primary bone marrow pathology such as myelodysplastic syndrome

While GHK-Cu has been studied for its ability to modulate gene expression in scientific literature, you wont typically find this detailed scientific information in cosmetic product descriptions

O.GibbR

Its also been speculated that oral methylcobalamin or injected hydroxycobalamin may be preferable in smokers, but that hasnt been conrmed

The Molecular Mechanism of Nitrogen-Containing Bisphosphonates as Antiosteoporosis Drugs