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Description
doi:10.3181/0703-MR-67

In humans, the injection is intravenous

Some common signs of B-12 deficiency include: B-12 injections offer a fast and effective way to increase your B-12 levels, providing a range of health benefits: Increased Energy Levels: One of the most immediate and noticeable effects of B-12 injections is a boost in energy

Most human research is on the full peptide, so quoting it as proof for the fragment is not evidence-based
