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In most cases, methylcobalamin is nontoxic, even in large doses

For another key nutrient in this space, see our guide on magnesium for anxiety and stress, which covers the GABA and parasympathetic pathways that complement what B12 does on the neurotransmitter side

Frequently Asked Questions About B12 Shots Q: How often should I get Vitamin B12 injections

Much of the supporting research summarized in peer-reviewed literature relies on animal studies, such as GLP-1 receptor-knockout mice and rodent injection trials, rather than large-scale human trials, and peptide-based drugs overall are described as rarely used in real-world patient care because of lingering questions about safety, effectiveness, and inadequate insurance coverage

For example, the antibiotic chloramphenicol can interfere with the effects of vitamin B, reducing the expected hematologic response to B therapy