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The best approach is the one you can stay consistent with

Researchers also found that GHK-Cu injections could help mice recover more quickly from anterior cruciate ligament (ACL) reconstruction surgery by promoting tissue remodeling and growth of the graft (where the new tissue meets the old tissue), which tends to be the weakest link in recovery from such operations [5]

I'm not a medically trained person and there are others on here who will be able to give you good advice

In the context of long COVID, Ta1 addresses the immune exhaustion and dysregulation that characterizes the condition, helping to restore appropriate T cell function, support viral clearance, and modulate the inflammatory cytokine environment