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Ethics declarations Competing interests SJW is the founder of Ridgeline Therapeutics, HN is a paid employee of Ridgeline Therapeutics and, since manuscript submission, ADW has also become a paid employee of Ridgeline Therapeutics

Vitamin B12, also known as cobalamin, plays a crucial role in the formation of red blood cells and the maintenance of the central nervous system

Hair follicles are among the most rapidly dividing cells in the body

Compounding pharmacies and research facilities use wall-directed slow injection and immediate refrigeration because decades of peptide stability research have proven it's the only method that consistently preserves oligopeptide structure across repeated freeze-thaw cycles