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Replying to
Supplements are mostly placebo and marketing. It's only valuable from competitive-amateur level athletes and forth. Although, one can argue it's a high quaility way to get nutrients quickly and without some unwanted companion, eg. protein powder without carbs or fat.
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Replying to
You might start with the indication for which you want to take supplements (depression, arthritis...etc) and read the meta-analyses of the RCTs. SV millionaires probably want to take supplements to cure death, which is as yet not a treatable medical condition.
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