History [edit] Descriptions of deficiency effects [edit] Between 1849 and 1887, Thomas Addison described a case of pernicious anemia, William Osler and William Gardner first described a case of neuropathy, Hayem described large red cells in the peripheral blood in this condition, which he called "giant blood corpuscles" (now called macrocytes), Paul Ehrlich identified megaloblasts in the bone marrow, and Ludwig Lichtheim described a case of myelopathy
This cooling signal travels through the nervous system, effectively reducing the brains perception of pain by distracting pain signals
The immune system reacts to the infection, but over time it can accidentally begin attacking the stomach as well
Bad news: those aggregates won't dissolve, they can cause nasty injection site reactions, and the peptide loses its biological activity
So it is fair to ask: does it really matter where you get your B12 injection