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Description
Depending on the severity of the deficiency, this can involve oral B12 supplements, B12 injections, or high-dose B12 supplements prescribed by a healthcare professional

doi: 10.1177/000992288602500409

This article clearly distinguishes between FDA-approved uses (none) and investigational findings

The problem is that research shows many people dont start to show these visual cues until BACs past the legal limit of .08 *
