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In England the government has set guidelines via establishing what the RDA for vitamins and minerals. RDA stands for recommended daily allowance. This quantity is so established that most of the population is assured of the right amount of a certain vitamin or mineral.
The vitamin information Office recommends that you, if necessary, to choose a supplement with 100% to 300% of the RDA. On the packaging of a supplement or food stands a ADH, but that does not distinguish between different population groups, gender and/or age. This RDA gives only an indication. This can sometimes be confusing.

An example:
A woman with a pregnancy desire has a daily supplement with 400 micrograms of folic acid. For her is that 400 micrograms is equal to 100% RDA. The RDA is 200 mcg for all other Dutch citizens. Therefore, on the packaging that 400 mcg is equal to 200% RDA.