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The effects of a vitamin B12 shot can last anywhere from a few days to a few weeks , depending on your bodys needs and current B12 levels
Here, B12 shots are given once a month
Significant ANOVA/KruskalWallis test results were then followed with post-hoc testing, which underwent the two-stage linear step-up procedure of Benjamini, Krieger and Yekutieli correction for multiple comparisons
Reported Adverse Effects In the available case series and observational literature, the most commonly reported adverse effects include: Injection-site redness or mild induration in approximately 8 to 12% of users Transient nausea, most often associated with oral formulations or higher injectable doses Lightheadedness in a small number of patients shortly after injection (under 2% of reported cases) Vivid dreams or mild sleep changes, reported anecdotally by a subset of users with no clear mechanistic explanation No published human case reports as of July 2025 document serious organ toxicity, malignancy, or endocrine disruption attributable to BPC-157
