Its hard to say, because theres a variety of substances that could cause such side effects to B12 injections
Ambar RF, Agarwal A, Majzoub A, et al
Although N-acetylcysteine (NAC) directly influences the pool of extracellular cystine and intracellular cysteine via a series of plasmatic redox reactions, in order to be effective, intracellular cysteine precursors must be designed to enter erythrocytes rapidly and use high activity enzymes within erythrocytes to liberate cysteine (Whillier et al., 2009
This limitation poses a significant challenge to investigations of the neural mechanisms underlying ASD, given the distinct roles of Glu and Gln in the Gln-Glu cycle within the central nervous system
Glutathione is comprised of three amino acids: L-cysteine Glycine L-glutamate Coined the "Mother of All Antioxidants", Glutathione is involved in many body processes and is great for helping to regulate our immune response and aid in the creation and repair of DNA
The absolute reference in recovery