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>If you really care about this then find and do a simple general blood test for your micros/vitamins. It will show you where you are deficient and can focus on supplementing on only those.

Presumably this will only show what you are deficient in based on the previous few days diet, right? So to have a decent measurement you should already have a very stable diet. If you eat like I do, random things from day to day, then your vitamin levels should differ from week to week, or are they much longer lasting?

> If you really care about this then find and do a simple general blood test for your micros/vitamins.

I wish they were cheaper (a broad set is >£100) - would love to do it say weekly, and be able to really see it against the food I've been eating (maybe keep a rough note of that, or just be able to think about it in terms of seasonally what I've been eating).

Magnesium is almost always grossly under dosed because the actually daily dose is quite substantial. I take a multivitamin and a supplemental magnesium and to get the daily recommendation I need to take two magnesium capsules as supplement. If they had included it in the multivitamin it would be a horse pill.