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Description
If a person is deficient due to insufficient B12, they may need to organize their diet to include more B12-rich foods or take an oral supplement
Someone referenced Buy-otc.com as a source and so I am still considering them as well

But GHK-Cu is just the tip of the peptide iceberg

This is a precautionary measure after any injection treatments
Immunometabolism (Cobham Surrey)

For A frequently cited 5-Amino-1MQ dosage for rodent models (mice and rats) is often in the range of 10-20 mg/kg of body weight per day