Would it be wise for most people to take a daily multivitamin or supplement? I believe we only need trace amounts of these vitamins and minerals, so even with a

Would it be wise for most people to take a daily multivitamin or supplement? I believe we only need trace amounts of these vitamins and minerals, so even with a 90% decline in mineral levels, it sounds like most people are still getting plenty of minerals. > 60% of adults do not achieve the average dietary intake (ADI) and 45% of Americans are magnesium deficient. I'm always a bit skeptical of claims like this, and those percentages are huge. I'm wondering why I've never heard about it before (although I'm very ignorant about a lot of things.) Are there any government efforts to make magnesium supplements widely available, or some other way to solve this problem?