why do vitamin b12 injections sting Which Vaccines Hurt the Most and Some Shots Cause More Pain? Combinatorial in situ cancer vaccines:

Conclusion The Hybrid Harms Hypothesis postulates that sustained spike protein expression from COVID-19 mRNA vaccination interacts with SARS-CoV-2 infections, including Omicron, to increase morbidity and mortality despite Omicrons lower virulence

Hirota, W

Epub 2020 Sep 29

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Plain-English explanation: Researchers were able to directly measure that losing body fluid changes blood volume in a way thats consistent with the total-body-water mechanism described above supporting the idea that dehydration can concentrate alcohol somewhat, rather than this being pure theory

If your diet includes plenty of B12-rich foods such as dairy products, meat, and fish, you might not need shots as frequently