You're right about deficiencies, but it's more complicated than just increasing intake. For instance: - For most people, vitamin D is lack of sunlight. - Magn

You're right about deficiencies, but it's more complicated than just increasing intake. For instance: - For most people, vitamin D is lack of sunlight. - Magnesium absorption depends on how well your intestines are working because ~50% is excreted. It's also related to diet and lifestyle (soda hinders absorption, coffee and stress increase excretion). On top of that, low intra-celullar Mg levels are not detectable with a simple blood test, so most people don't even know they are deficient until it gets severe. - Too much vitamin A is toxic, but our body can metabolize vitamin A from carotenoids like Astaxanthin which are much better tolerated. There are now more studies concentrating on the precursors to vitamins and absorption than the vitamins themselves.