Hello. Contrary to popular belief, NRV/RDA is actually the minimum amount of a nutrient required by an 'average, healthy' person in order to avoid a deficiency. It is not a maximum. If you are deficient, you need an abundance of the vitamin/mineral in order to correct it, which is why you find products of up to 100ug/4000IU available on the market.
Our Multivitamin provides 5ug of D3, which is the minimum amount for an average, healthy person, as described above. Different countries have different recommendations on D3 amounts, based on the amount of sunshine the country receives per season. Unfortunately, it is not possible to create a single product that covers these varying recommendations.
We do not sell a stand-alone 5ug D3 product, I'm afraid. You will ned to look to other suppliers for this.