b12 2000 mg injection side effects Are Vitamin Shots Right for You? Vitamin B12 - PMC

Are B12 Shots Better Than Pills Yes

How quickly will you feel a difference

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By aiding in energy production and fat metabolism, B12 can complement a weight loss program that includes proper diet and exercise

Needs much more research

One of the RCTs found significant mean improvements in Clinical Global Impressions-Improvement (CGI-I) score and cellular methylation capacity, but not in the Aberrant Behaviour Checklist (ABC), Social Responsiveness Scale (SRS) or GSH metabolism, with those who had the lowest methionine status at baseline (suggesting impaired methylation capacity) significantly more likely to respond to supplementation