Unlike many other antioxidants that we must get primarily from our diet (like Vitamin C or Vitamin E), our bodies actually produce glutathione naturally within the liver and nearly every other cell
The LIP is dynamically set by transferrin/TfR1 uptake (iron import), ferritin (safe storage via H-chain ferroxidase activity), NCOA4-mediated ferritinophagy (ferritin degradation releasing Fe), heme turnover by HO-1 (which can paradoxically raise LIP if not matched by storage/export) and mitochondriallysosomal exchange routes that shuttle iron for heme/FeS biogenesis
Beyond energy metabolism, NAD+ is now understood to serve as a critical co-substrate for a range of enzymes deeply involved in cellular health, ageing, and stress response including sirtuins (SIRT17), poly-ADP-ribose polymerases (PARPs), and CD38/157 ectoenzymes making it one of the most broadly relevant research molecules available from UK peptides suppliers today
Pfizer acquired Metsera in 2025, which consolidated DD-03 and DD-15 into Pfizer's internal pipeline
