Despite their small size, they have immense biological significance in molecular biology: peptides function as a peptide hormone like PPY, enzymes, neurotransmitters, and signal molecules that mediate immune responses, cell signaling, tissue repair, and metabolic regulation
Nicotinamide N-methyltransferase knockdown protects against diet-induced obesity by augmenting energy expenditure
Bariatric surgery Restricted stomach = reduced B12
If you're in UK, I recommend reading all these documents below UK B12 documents BSH Cobalamin and Folate Guidelines b-s-h.org.uk/guidelines/gui
Whether its due to diet, stress, age, or absorption issues, a deficiency can cause fatigue, brain fog, irritability, and more
Weeks 4-12 recovery, exercise capacity, and skin-quality reports emerge anecdotally