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For instance, a study by Grace et al., on lambs receiving a single 2 mg subcutaneous B12 injection demonstrated significant increases in serum and liver B12 concentrations for up to 24 days compared to untreated animals (2)

What Remains Unknown About Long-Term Use Long-term safety remains unclear for systemic and injectable GHK-Cu, especially repeated use, off-label use, compounded preparations, and use in higher-risk populations

So, you might be wondering, Are there any side effects or risks with B12 Vitamins

While elevated MMA blood concentration is considered the specific indicator of deficiency (19), other clinical assays are often used as biomarkers of vitamin B 12 status sometimes in combination