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Vitamin B12 is naturally found in animal food sources such as meat, fish, poultry, and dairy products
If benzyl alcohol is a concern for specific cell types, sterile water may be preferable
Choong et al
There are also potential hormonal effects and unknown long-term risks due to limited research, especially with intravenous use, which could also strain the kidneys or liver
[link] Murase Y, Hattori T, Aoyama E, Nishida T, Maeda-Uematsu A, Kawaki H, Lyons KM, Sasaki A, Takigawa M, Kubota S., "Role of CCN2 in Amino Acid Metabolism of Chondrocytes", J Cell Biochem 117: 927-937 (2016)