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In addition, due to the presence of P-glycoprotein (referred to as multidrug resistance associated membrane protein), drugs could be transported back into the blood by ATP-dependent efflux pumps

10.1016/j.jjcc.2014.02.001 30 FrederickD
So glad I decided to try

Trends in use over time are complicated by multiple means of acquiring the drug: through administration by physicians in clinics and hospitals and by caregivers using over-the-counter formulations at home

Consistent daily use can help maintain elevated GHK-Cu levels and maximize the benefits
