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:: Vitamins and Minerals
 Daily Vitamin Requirements
 With a few exceptions, the body is unable to
make vitamins;
they must be supplied in the daily diet or through
supplements. One exception is vitamin D, which
can be produced in the skin when the skin is exposed
to sunlight. Another vitamin, vitamin K, is not
made by the human body but is formed by microorganisms
that normally flourish in the intestinal tract
only when green, leafy vegetables and vegetable
oils are ingested.
The body's vitamin requirements are expressed
in terms of recommended dietary allowances, or
RDA. These allowances are the amount of essential
nutrients that, if acquired daily, are considered
to be sufficient to meet the known nutritional
needs of most healthy persons. In the United States,
the RDA values are established by the Food and
Nutrition Board of the National Academy of Sciences/National
Research Council (NAS/NRC). In addition, two agencies
of the United Nations--the Food and Agriculture
Organization and the World Health Organization--develop
RDA for different, worldwide population groups In the past, the strength of a vitamin or the
amount of the vitamin necessary to produce a certain
effect in the body was often expressed in terms
of international units, abbreviated IU. The unit
corresponds to a weight of the purified vitamin,
and its value differs from one vitamin to another.
Today, the strength of a vitamin is generally
expressed directly in metric weights - micrograms
or milligrams.
 NSI
Synergy Women's Multi-Vitamin Version 4 - 240 Caps
Promotes foundational daily
nutrition. It has key nutrients that may
naturally alleviate menstrual and menopausal symptoms.
Designed to help protect the heart, brain, eyes, breast,
gastrointestinal tract, joints, and bones.
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NSI
Synergy Men's Multi-Vitamin Version 2 - 240 Caps 
