Common side effects include, but may not be limited to: pain or redness at the injection site mild diarrhea pruritus (itching) increased swelling joint pain dizziness headache nervousness or anxiety Serious side effects may include: allergic reactions peripheral vascular thrombosis hypokalemia (low potassium levels) pulmonary edema (fluid build-up around or in the lungs) thrombocytosis congestive heart failure There have been reports of anaphylactic shock and death after the parenteral administration of vitamin B12
Further Reading If you found this post on the Gary Brecka supplement list helpful, you may also like: Andrew Huberman Supplement List A science-driven stack focused on sleep optimization, cognitive performance, stress regulation, and foundational health using evidence-based protocols
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Specifications Sources & References Peer-reviewed research Journal of Nutrition Glutathione metabolism and its implications for health 2004 DOI: 10.1093/jn/134.3.489 PMID: 14988435 Wu G, Fang YZ, Yang S, Lupton JR, Turner ND View Source Molecular Aspects of Medicine Glutathione: overview of its protective roles, measurement, and biosynthesis 2009 DOI: 10.1016/j.mam.2008.08.006 PMID: 18796312 Forman HJ, Zhang H, Rinna A View Source Biochimica et Biophysica Acta Glutathione transferases and their role in oxidative stress 2013 DOI: 10.1016/j.bbagen.2012.11.017 PMID: 23201197 Allocati N, Masulli M, Di Ilio C, Federici L View Source Annals of botany Antioxidants, oxidative damage and oxygen deprivation stress: a review 2003 DOI: 10.1093/aob/mcf118 PMID: 12509339 Blokhina O, Virolainen E, Fagerstedt KV View Source International journal of dermatology Glutathione as a skin-lightening agent and in melasma: a systematic review 2025 DOI: 10.1111/ijd.17535 PMID: 39444151 Sarkar R, Yadav V, Yadav T, et al
