Vitamin B-12 will only help with concentration if you are B-12 deficient. B-12 is important in red blood cell production for carrying energy around the body and for proper neurological function.
However, many people are B-12 deficient without knowing it due to our modern diets, or because they are vegan/vegetarian (digestible B-12 is only found naturally in meats). Also, some B-12 deficiencies doesn't show up on blood tests because other conditions are masking it.
Some symptoms of B-12 deficiency:
Biotin, vitamin B6, vitamin B12.
The Polynerv 1000 vitamin tablet is scientifically based on the high potency. It basically contains 500 mgs of Vitamin B1, 1mg of vitamin B12 and 250mg of vitamin B6.
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Vitamin B1, B2, B3, B6, B12, H and Folic acid.
Protein, Vitamin B6, Vitamin B12, Phosphorus, Zinc and Iron
Vitamin B12, and folic acid. B6 Source: http://answers.Yahoo.com/question/index?qid=20090329200337AAq2QsK
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Biotin, Niacin, Zinc, Vitamin B6, Vitamin B12, Vitamin B5, and Amino Acids.
A deficiency in the essential Vitamin B12.