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Injectable and IV routes dominate because standard oral glutathione has very low bioavailability it's largely degraded in the gut before reaching circulation
For market-wide context, Q1 2026 vendor pricing trends tracked 148 retatrutide observations across 5 vendors with a median of $6.37/mg the widest absolute range of any peptide in the deep-dive set
104 The figure below illustrates in vivo tissue drug levels of sunitinib from a single injection of either GB-103 (red, squares) or GB-102 (blue, circles) in a rabbit eye
First-Pass Metabolism The body has a process called "first-pass metabolism," where the liver and gut process substances before they reach the rest of the circulation
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