AI-generated fake citations flood scientific literature, study finds

A Lancet study led by Columbia University researchers finds a growing share of citations in scientific papers are fabricated or AI-generated. Analyzing 2 million papers and 97 million citations, they identified about 4,000 fabricated references across 2,800 papers, with the rate rising from 2023 to 2025 and into early 2026. The rising prevalence could skew systematic reviews and clinical guidelines and reflects broader shifts in citation culture toward checklist-style referencing. Publishers report varying levels of tooling to flag or validate citations, underscoring the need for stronger verification as AI use in research grows.