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This is a commonly referenced study from 1963 claiming a half-life of 5-6 days: nature.com/articles/198200a0 Although I would not cite it as an authority, the six-day half-life has also made it onto the B12 page in Wikipedia, seemingly unchallenged

By blocking NNMT, 5-Amino-1MQ increases NAD+ levels and activates SIRT1, the longevity gene, promoting fat loss, energy production, and metabolic rejuvenation

The peptide's actin-sequestering activity proves particularly important for endothelial cell migration, with studies showing TB-500 significantly enhances endothelial cell migration rates and tube formation in angiogenesis assays while promoting the formation of stable, mature blood vessels with appropriate pericyte coverage