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Intramuscular injections typically produce early haematological responses within 34 days, whilst neurological symptoms may begin improving within 12 weeks
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Last reviewed: May 12, 2026 Last updated: May 12, 2026 Written by: Jay Hastings , CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations
PMID: 12904168 Munusamy S, et al
Always use a new, sterile needle and syringe for each injection
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