I stopped taking most of my suppliments for two reasons:
1. I took the above advice a couple of weeks ago and started tracking my nutrition and found out I was doing extremely well at covering all of my bases, even at <2000cal/day.
2. I'd rather spend that extra money on more high-quality food than on suppliments. I was taking a cheaper variety (Nature Made) and many of the ingredients were not easily absorbable, ie magnesium oxide and elemental calcium.
I still take chelated magnesium due to leg cramps and slow digestion, iodine if I don't get enough seameat, vitamin d if I don't get enough sun, which is almost never now, probiotics, and fish oil. The end goal is to get rid of these through better nutrition as well.
I wish I liked to eat liver.