NICE guidance recommends intramuscular hydroxocobalamin as first-line treatment for B12 deficiency caused by pernicious anaemia or malabsorption
FDA materials flag compounded injectable GHK-Cu for limited human safety data, aggregation risk, peptide-related impurities, and possible immunogenicity
Four hundred and thirty (88%) of these patients have conditions for which the drug is a proven benefit , so the increased frequency of injections accounts for most of the observed excess
"No reported long-term problems" reflects a lack of monitoring, not a clean safety record
Additionally, if your gastrointestinal tract does not function normally, as with celiac disease or Crohns disease, you may have trouble absorbing or releasing vitamin B12, which will affect the levels in your body and how long the vitamin stays there
Maybe it looks dull, or dry, or somehow older than before