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The best needle for B12 injection into fat tissue would be within the 4-5 mm size range, combined with a gauge of 30G or higher
This ability gives it a broader influence on cellular function, especially in areas such as the nervous system, the liver, and the brain
Deficiency can worsen irritability or low motivation, so replenishing it through injections may contribute to better mental clarity and resilience
Schulz JB, Lindenau J, Seyfried J, Dichgans J