A 2025 IV safety study in two healthy human volunteers administered doses up to 20 mg without adverse events the highest quality human safety data currently available, but from only two subjects
Reserve purely systemic injection for situations where local access is difficult or when addressing multiple widespread issues
Muscle weakness or bone pain from overcorrection
While side effects are generally mild and temporary, they may include redness or soreness at the injection site, a temporary "flushed" feeling, or brief lightheadedness
Duration of Treatment and Maintenance Phase Treatment for moderate neuropathy with B12 can last 3-6 months
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