Probably none: In the first world, there is an adequate supply of every vitamin and nutritional need in the typical diet. So vision and hearing do fine and it would take an extreme diet to disturb these. You might needs supplements for other health conditions but they will not help these systems.
Answered 4/7/2014
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2 doctors weighed in across 2 answers
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
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