However, certain peptides, particularly very small ones like KPV (just three amino acids), appear to retain meaningful bioavailability when taken orally
A significant amount of research has indicated that individuals with anaemia frequently experience osteoporosis as well (125, 126), which may be related to iron overload-mediated ferroptosis caused by long-term blood transfusions in anaemia patients (127), and their fracture risk is associated with the frequency of blood transfusions (128)
Lin YF, Hassan Z, Talukdar S, Schat H, Aarts MG (2016) Expression of the ZNT1 zinc transporter from the metal hyperaccumulator Noccaea caerulescens confers enhanced zinc and cadmium tolerance and accumulation to Arabidopsis thaliana
It is found in human plasma, saliva, and urine, and is studied for its potential role in tissue remodelling and cellular repair processes
Note that amides have pK_4 ~9.5