Vitamin Intake

Adequate vitamin intake is important for overall health and normal body function. There is a vast amount of information available regarding what vitamins and quantities a person should consume to ensure proper body function. In an effort to ensure that our patients and the general public has access to scientifically-backed, accurate information, we have provided the recommended daily intake ranges for most common vitamin and mineral supplements in the table below. These values are established by the U.S. government, based upon scientific data and disseminated by both the NIH and USDA.

The RDI is the recommended minimum daily intake amount and the UL is the maximum limit for daily intake in healthy adults. Please note that “ug” (micrograms) is sometimes noted as “mcg.”

VitaminRDI amounts (per day)Maximum (per day)
Calcium1000mg2500mg
Copper900ug10,000ug
Iodine150ug1100ug
Magnesium320mg350mg
Phosphorus700mg4g
Selenium55ug400ug
Zinc8mg40mg
Sodium1.5g2.3g
Chloride2.3g3.6g
Potassium4.7gnone
Iron18mg45mg
Vitamin A700ug= 2500IU3000ug= 10,000IU
Vitamin C75mg2000mg
Vitamin D15ug = 600IU100ug= 4000IU
Vitamin E15mg = 22.4IU1000mg = 1493IU
Thiamin (B1)1.1mgnd
Riboflavin (B2)1.1mgnd
Niacin (B3)14mg35mg
Vitamin B61.3mg100mg
Folate400ug1000ug
Vitamin B122.4ugnd
Vitamin K90ugnd
Choline425mg3.5g
Biotin30ugnd
Water3.7L 
Carbohydrates130g 
Fiber25g 
Linoleic acid (n-6 polyunsaturated fatty acids)17g 
Linoleic acid (n-3 polyunsaturated fatty acids)1.1g 
Protein46g 
Histidine18mg/ g protein 
Isoleucine25mg/ g protein 
Leucine55mg/ g protein 
Lysine51mg/ g protein 
Methionine25mg/ g protein 
Cysteine25mg/ g protein 
Phenylalanine47mg/ g protein 
Tyrosine47mg/ g protein 
Threonine27mg/ g protein 
Tryptophan7mg/ g protein 
Valine32mg/ g protein 

(nd = not determined)

References for all recommended values:

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