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It is a real search term and a real phenomenon, with the nuance covered in this article
If you are already taking a B12 supplement separately, the additional B12 from the injection is unlikely to cause harm but is also unlikely to add benefit
10.3389/fpsyt.2021.671151 Front Psychiatry
Synergistic Effects Augmented NAC works synergistically with other dietary supplements and vitamins, as demonstrated in laboratory tests
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