formulasignal_get_formula_history

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Return the controlled historical timeline for one covered product, with each state classified by what it can actually support. When to use: Use to find out whether a product has changed, how deep the recoverable history is, and which states are comparable to each other. What it cannot provide: It never presents an observation window as an exact reformulation date, and it never reports an unreviewed candidate as a confirmed change. 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.