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Both have also had oral GLP-1 drugs on the market for nearly 20 years and are now banking on injectable GLP-1s for diabetes and weight loss to propel future sales
Plasma Concentration: From ~200 ng/mL to ~80 ng/mL Research measuring GHK-Cu across different age groups has found plasma concentrations of roughly 200 ng/mL around age 20, falling to approximately 80 ng/mL by age 60 a decline of more than 50% over four decades
For individuals using GLP-1 medications, experts generally recommend undergoing a DEXA scan before starting treatment to establish a baseline for body composition
Starting with tirzepatide injection and optionally adding genetic testing ensures evidence-based, individualized therapy rather than off-label polypharmacy
Going from 2.5mg to 5mg (doubling the dose) does not double the weight loss
