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A stress response pathway that responds to various cellular insults, including amino acid deprivation, through the GCN2 kinase, to phosphorylate eukaryotic translation initiation factor 2 (eIF2), halt general cap-dependent protein translation and increase transcription of endoplasmic reticulum chaperone proteins

Hes used the subcutaneous route as well (source)

Bottle and label:Using a funnel, carefully pour your serum into sterilized glass bottles

Laboratory Testing Before starting Vitamin B12 injections, laboratory testing is often recommended to determine your baseline B12 levels and to monitor your progress

As FDA-approved medication, it works best when combined with diet and exercise