how do you inject a b12 shot to Give Yourself Injection Best Vitamin B12 Injection Sites
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Both are medicinal fungi that are often taken together to support the immune system

Vitamin B12 and semen quality. Biomolecules 7.2 (2017): 42

Vitamin B12 Methylcobalamin Vitamin B The half life of a B12 injection averages about 6 days from the studies I've seen so the answer is yes
Huang ZH, Espiritu DJ, Uy A, Holterman AX, Vitello J, Mazzone T

According to Heber, the only reason to take extra B12and it doesnt have to be injected

[DOI] [PMC free article] [PubMed] [Google Scholar] 236.Cianci, M