What recommendation specifies the point at which a nutrient is likely to become toxic?

What recommendation specifies the point at which a nutrient is likely to become toxic?
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There is no such recommendation. There is what is called "LD50",which is the approximate dose that would cause death in 50% of thepeople who took that much, but nutrients are rarely evaluated likethat for toxicity. Vitamins that can be overdosed on are thefat-soluble vitamins (A, D, E, K). The rest of the vitamins havevirtually no dangerous dose. For any vitamin, there is a labelwhich shows recommended dose.
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