Most of them have bad excipients and can throw balance out of whack. They can be powerful tools though. Use pure ones, sparingly and knowing what you are doing. A random multivitamin is probably net negative. Quality food high in micros first (organ meats, oysters, etc)
Discussion
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Supplement industry is a scam. It’s a modern fiat industry that has not passed the test of time.
Pill form “ vitamin “ is the not the same as the human body deriving vitamin via natural pathways.
On the other hand herbal supplements are Lindy.