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b12 is still low with injections What are the benefits of injection? Sublingual B12 vs. B12 Injections: B12 Injections or Oral B12: Which Is Better for You? Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency PMC Sublingual Vitamin B12: Is Taking Supplements under Your Tongue More Effective? Ro B12 Injections vs. Oral Supplements: Which Is Better? Efficacy of sublingual versus oral vitamin B12 supplementation for the treatment of vitamin B12 deficiencyA prospective randomised open label study Clinical Nutrition ESPEN
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