A lot of commercial supplements (in the U.S.) are overloaded with the vitamins and minerals they contain. Significantly overloaded. Your body is only able to absorb so much of any given mineral/vitamin at a time. It can still absorb excess into the blood stream, but if your tissues/organs don’t need them then they will be filtered out by your kidneys. And you end up flushing them down the toilet.
Keep in mind, you aren’t “meant” to need to take vitamins/supplements. You are supposed to get them from your regular diet. Supplement pills are useful for covering dietary shortfalls. Marketing is used to convince people that there is benefit to excess consumption. If you have a healthy diet you shouldn’t need to take supplements (medical conditions/individual considerations are obviously exceptions).
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