Because my GP doesn't want to perform a few consecutive tests over a number of days to test overal levels and thus only looks at a single data point and goes "well x and y are a bit low but Z is fine (but actually also a bit low) so everything is fine" you don't need anything. And because just taking a few general supplements or a multivitamin doesn't really harm anything even if my diet should provide everything normally.
Problem is when I'm having a bout of IBS issues my intestines don't always pick up the "should normally be sufficient" amount of stuff in my normal diet and a boost in levels can be just what's needed to keep things normal.
Biting the hand that feeds IT
