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Chronic conditions (tendonitis, joint issues): Typically requires 48 weeks of consistent use to see substantial improvements, with continued benefits over 12+ weeks

Additional side effects that may occur with injectable B12 include a headache and feelings of pins and needles, says Drugs.com

A number of shoulder and elbow conditions can lead to pain and discomfort in the upper arm, including arthritis, frozen shoulder, and tendonitis

When pain lasts longer than a week, gets worse, limits your shoulder movement, or comes with swelling, weakness, numbness, or spreading redness, it may be a sign that something more serious happened during or after the injection

Research use only: None of the peptide companies we reviewed sell FDA-approved medicines

Effects of Methylcobalamin on neuralgia