This blog post will walk you through: vitamin a provitamin. Don’t worry, we’ve got all the answers about this subject.
References[Edit]
[1] The term previtamin is a synonym. Menadione is a synthetic provitamin of vitamin K.
Provitamin D 2 is ergosterol, and provitamin D 3 is 7-dehydrocholesterol.
Function
Dations for vitamin A, as well as other nutrients, are provided in the Dietary Reference Intakes (DRIs) developed by the Food and Nutrition Board at the National Academies of Sciences, Engineering, and Medicine.
These values, which vary by age and sex, include:
Recommended Dietary Allowance (RDA): The average daily level of intake that is enough to meet the nutrient needs of nearly all (97% to 98%) healthy people. Adequate Intake (AI): This level is established when there is not enough scientific research evidence to develop an RDA. Dietary reference intakes for vitamin A:
Infants (AI)
0 to 6 months: 400 micrograms per day (mcg/day)
7 to 12 months: 500 mcg/day
The Recommended Dietary Allowance (RDA) for vitamins is how much of each vitamin most people should get each day.
Children (RDA)
1 to 3 years: 300 mcg/day
4 to 8 years: 400 mcg/day
9 to 13 years: 600 mcg/day
Adolescents and adults (RDA)
Males age 14 and older: 900 mcg/day
Females age 14 and older: 700 mcg/day (for females aged 19 to 50, 770 mcg/day during pregnancy and 1,300 mcg/day during breastfeeding)
The best way to get the daily requirement of important vitamins is to eat a wide variety of fruits, vegetables, fortified dairy foods, legumes (dried beans), lentils, and whole grain.
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Vitamin A & provitamin carotenoids.