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There's no established "ideal" percentage yet but 1-2% is the evidence-backed range

In some embodiments, any formulation or composition described herein has a pH that allows for sterilization (e.g., by filtration or aseptic mixing or heat treatment and/or autoclaving (e.g., terminal sterilization)) of a formulation or composition without degradation of the therapeutic agent

This should take into account factors that may influence both pharmacokinetics and target-organ sensitivity, including age, physiological status (e.g

Concentration, delivery method, duration, and the specific outcome being measured all shift the GHK-Cu timeline

In this trial, the patients studied at 13 years post diagnosis were likely to have lost the majority of nigral and striatal dopaminergic function 56