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The young man's symptoms long outlasted the immediate effects of his acute injury and included loss of concentration, memory, mental energy, focus, and physical well-being, often accompanied by loss of lean muscle mass and an increase in body fat

The most commonly reported side effects are mild and temporary, such as slight redness or soreness at the injection site

However, the rate at which the B12 is released can be a little slower meaning that if you need B12 quickly, injections will be the better option

In order to assess this, human PMN cells were isolated from the venous blood of healthy volunteers who had not received non-steroidal anti-inflammatory drugs (NSAIDs) for at least 14 days