It is also messy
Vitamin B12 Shots in Canton, MI: What You Need to Know Vitamin B12 shots are an effective way to address vitamin deficiencies and boost energy levels
2 In comparison with other B vitamins, B 12 is not synthesized by animals, fungi, or plants
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Animal Toxicology Studies Animal toxicology studies tested doses from 0.0027 mg/lb to 9.1 mg/lb via intraperitoneal, intramuscular, intravenous, and oral routes for up to 6 weeks, finding: No acute toxic or lethal dose No gross or histologic toxicity in major organs No hepatotoxicity or nephrotoxicity Negative Ames test (no mutagenicity) Negative chromosomal aberration tests (no genotoxicity) No teratogenicity in rat pregnancy studies No local injection site irritation The LD1 (minimum lethal dose) could not be achieved despite aggressive testing