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Symptoms of vitamin B12 deficiency include: Anemia Intestinal disorders and weight loss Fatigue, weakness, lightheadedness Memory loss or confusion Depression or dementia Rapid heartbeat and respiration Mouth or tongue soreness or bleeding Excessive bruising Injections are the most effective means of administration of vitamin B12 since they do not depend on the body's ability to absorb the substance through the gastrointestinal tract

RESEARCH USE ONLY (RUO): This product is supplied strictly for laboratory research and development purposes only

This means your fourth dose might come up slightly short unless you account for dead-space volume or use a low dead-space syringe

References: NHS

Neither is a recommendation for human administration