The short answer: the ideal needle size for a B12 injection depends on the injection method
Polimanti R, Carboni C, Baesso I, Piacentini S, Iorio A, De Stefano GF, Fuciarelli M (2013) Genetic variability of glutathione S-transferase enzymes in human populations: functional inter-ethnic differences in detoxification systems
Deardorff MA, Kaur M, Yaeger D, Rampuria A, Korolev S, Pie J, et al
The metabolic reprogramming of cancer cells through amino acids affects epigenetic change
For instance, Jomova et al (177) demonstrated that an excess of copper ions led to the aggregation of fatty proteins and abnormal expression of Fe-S cluster proteins, resulting in protein toxic stress and cell death
Differential effects of depleting agents on cytoplasmic and nuclear non-protein sulphydryls: a fluorescence image cytometry study