formulasignal_explain_signal

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Explain one approved FormulaSignal Signal: a confirmed, reviewed change between two comparable product states. When to use: Use when a product record or history response named a signal_id and you need the before state, the after state, the observation window, and the evidence. What it cannot provide: It has no access to unreviewed candidates, review deliberation, or the internal review queue. A signal_id that is not approved returns not found. Limits: Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.