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But it is still unclear whether B12 injections can promote weight loss in humans

the B12 is there for energy support

The authors reported that maximal brain GSH concentrations were measured ~90110 min after the start of the infusion, and had not returned to baseline levels by 120 min after the start of the infusion

So meanwhile

This table provides a clear snapshot of the varying lifespans and the critical factors that dictate how long GHK-Cu vial lasts

Increased excitability also increases the glutamate/glutamine neurotransmitter cycle flux as well as release of K + associated with pre and post synaptic depolarization and uptake of K + by the astrocytes