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These changes occur at the 2nd, 8th, 15th, and 27th positions and are believed to possibly enhance the peptides stability against enzymatic degradation, particularly from enzymes like dipeptidyl peptidase-4 (DPP-4)
doi: 10.1080/1547691X.2021.1959677 69
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Studies have found that the longer cellular damage is allowed to occur, the more cellular function is impaired, giving way to the accumulation of even more damaged cells and accelerated aging
The limitation: both trials used single-dose infusions
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