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vital tool
vitality
vitamin
vitamin A deficiency
vitamin A levels
vitamin A status
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vitamin A supplementation
vitamin B1
vitamin B12
vitamin B12 concentration
vitamin B12 deficiency
vitamin B12 levels
vitamin B2
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vitamin B6
vitamin C
vitamin C concentration
vitamin C content
vitamin C deficiency
vitamin C intake
vitamin C levels
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vitamin C supplementation
vitamin D
vitamin D analogs
vitamin D analogues
vitamin D binding protein
vitamin D deficiency
vitamin D insufficiency
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vitamin D intake
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