does ghk cu develop tolerance or lose effectiveness over time Unlocking the Secrets of GHK-Cu: The Revolutionary Peptide for Youthfu does ghk-cu build tolerance or
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Its ability to aid in post-inflammatory hyperpigmentation (PIH) and minor scar reduction also offers a comprehensive solution for improving overall skin clarity and texture

2012 Feb;42(1):71-8

Rats in a transparent morris water maze use elemental and configural geometry of landmarks as well as distance to the pool wall

Just wondering if your GP ever actually tried to determine the cause of your B12 deficiency...might be worth re-visiting...especially if your health is poor or your are suffering any symptoms that are bothering