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K2 and taurine is readily available in meats, eggs and dairy. People who forgo these natural foods we were designed (evolved) to prefer should take supplements. Magnesium is a bigger problem since it has been leached out of agricultural soils by generations of industrial farming. Most people are deficient. Since vitamin D metabolism and lots of other processes require magnesium, most people are also deficient in bioavailable D, which leads to other malfunctions, like immune definpciencies that …
Plants don't make their minerals, but pull them from the soil. When the soil gets depleted, so will the plants. Traditional sources of magnesium don't have as much as they used to. Magnesium is difficult to measure accurately but red blood cell magnesium is considered the best test. Cheap. Most people find they're low. Apparently symptoms are also a good measure. My symptoms were heart arrhythmia and horrid leg cramps. They're gone since I boosted magnesium.