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How Long Does Vitamin B12 Take to Work? Timeline & Signs Performance Lab How Quickly Does B12 Shot Work? Does It Help to Lose Weight? Sublingual Vitamin B12: Is Taking Supplements under Your Tongue More Effective? Ro 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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