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Intramuscular injection may be clinically preferable to oral supplementation in specific situations: For individuals whose bloodwork shows deficiency or insufficiency in B12, vitamin D, or other measurable nutrients, and who have not achieved adequate levels through oral means
By helping to increase the production of red blood cells, vitamin B12 may improve oxygen delivery to the muscles during exercise
This reduces overall efficacy and makes progress assessment impossible
It is used to treat Vitamin B12 deficiency, pernicious anemia, and certain nerve-related conditions
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