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But a growing body of research is pointing to a different molecule: GHK-Cu, a naturally occurring copper peptide your own body produces

For confirmed deficiency with neurological symptoms , intramuscular cyanocobalamin injections are preferred, typically administered as 1000 mcg daily for one week, then weekly for four weeks, followed by monthly maintenance therapy

Some reviews describe a broad range of experimental findings, but there remains a gap between promising research and established, FDA-approved clinical use

Pregnancy and lactation: Safety is not yet clear