But RDAs (also known as RNIs-Reference Nutrient Intakes or NRVs-Nutrient Reference Values) are set only at a minimum level that will prevent deficiency leading to disease. For example, the RDA for vitamin C will prevent scurvy and the RDA for vitamin D will prevent rickets. But these are hardly modern threats.
So “adequate to prevent deficiency” does not mean optimum to promote vitality and health.
For example, years of research indicate that the optimum levels of the following nutrients are significantly higher than the RDAs:
- B vitamins, which are vital for energy. The optimum levels are 3 – 5 times the RDA.
- Vitamin C – the optimum level is 500mg a day (the RDA is only 60mg).
- Vitamin D – optimum intake is far higher than the current, woefully inadequate, RDA level. So Public Health England are now recommending that everyone should supplement in the winter. The higher levels trigger multiple health benefits see https://nutrishield.com/the-products/vitamin-d/.
- Vitamin E. An important anti-oxidant which protects against tissue damage from free radical action – including DNA damage. It is a vital immune system nutrient and works synergistically with vitamin C. The combination of vitamin E, C and zinc has been shown to have an important effect on long term eye health.
- Selenium – depletion is linked to a higher risk of cancer. The optimum level is at least 2½ times the RDA.
- Chromium is involved in the metabolism of fats and carbohydrate and insulin, which is why adequate chromium is important for everyone and especially diabetics or pre-diabetics.
On the other hand, there are some vitamins and minerals where it is NOT advisable to supplement with more than the RDA – vitamin A being a good case in point. And there are other nutrients where the average diet does provide enough.
Nutrishield Essentials contains all 23 essential vitamins and minerals at the levels considered optimum for a daily supplement according to 35 years of research by Dr Paul Clayton.
And all the vitamins and minerals are natural-source in the forms that are most bioavailable. So they’re just as effective and potent as the ones you eat in fruits, vegetables and other foods.