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2 Additionally, contrary to previous understanding, symptoms of withdrawal are often severe, and can include increased suicidal ideation

doi: 10.1016/S0006-291X(05)81127-1

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For patients diagnosed with a vitamin B12 deficiencyespecially when caused by problems with absorption in the digestive tract (such as pernicious anemia, certain gastrointestinal conditions, or after specific surgeries)oral supplements may not be effective

Chest 158(3):10601068 Hoy RF et al (2022) Current global perspectives on silicosis-convergence of old and newly emergent hazards

The timeline varies based on the nature of the injury, the dosage prescribed, and individual biology