Requires labels for certain FDA-regulated human drugs to disclose if the product contains a major food allergen or an ingredient made from a gluten-containing grain. Labels must both state the presence of the allergen/grain-derived ingredient and list each such ingredient — and, when applicable, identify the type of gluten‑containing grain (for example, wheat, barley, or rye). The rule takes effect on the earlier of a date set by the HHS Secretary or two years after enactment.