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Multiple reddit threads document batch inconsistencies from research suppliers: one user submitted samples from three different vendors to independent mass spectrometry testing and found purity ranging from 94.2% to 68.7%, with one sample containing significant des-amino AOD-9604 (an inactive degradation product)
Avoid applying strong vitamin C products, high-concentration retinoids, or low-pH chemical exfoliants at the same time as AHK-Cu
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AHK-Cu may also reduce the secretion of transforming growth factor-beta1 by dermal fibroblasts
Rotate the site every time, because injecting the same spot repeatedly can cause a fatty lump (lipohypertrophy) that slows absorption, a point the NHS is clear about when it advises you to rotate sites daily
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