For more on the diluents own shelf life, our guide on how long bacteriostatic water lasts is a useful companion read
GI effects are most pronounced
You can try and encourage dietary changes and/or B12 supplements, but because B12 is so important to the nervous system, I almost always provide B12 injections for three months to boost brain repair, followed by a sublingual maintenance formulation
BUYING & USAGE GUIDE Buy GHK-Cu from a brand that clearly shows the product form, intended use, directions, supply length, active amount or concentration where applicable, lab testing, support information, and Certificate of Analysis access
They also support liver health, which is essential for effectively metabolizing fats