does sublingual b12 work as well as injections Efficacy of different routes of vitamin supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis B12 Injection vs. Oral Supplements:
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It is also shown to have positive impacts on a vast range of problems including fatigue and migraines

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Monitor your overall health so that treatment stays appropriate and B12 is not masking another issue such as folate deficiency

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