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Individuals with severe deficiency, high physical demands, illness recovery needs, or chronic fatigue should choose a B12 IV infusion over a shot

Users report reduced pain with resisted elbow flexion and improved tolerance for pulling movements

PMID: 38302593 | doi:10.1038/s41366-024-01473-y Sanyal AJ et al

But these levels naturally decline with age and drop even further in response to chronic stress, inadequate sleep, poor dietary protein intake, heavy alcohol use, and prolonged exposure to environmental pollutants

Metabolomic profiling of aqueous humor from glaucoma patientsthe metabolomics in surgical ophthalmological patients (MISO) study