We asked five AI assistants what magnesium to buy, 500 times
228 brands were named at least once, and no two assistants recommended the same shelf. Thorne took 66% of Grok's answers and 25% of Claude's, on the same questions on the same day. The finding that changed how we build: assistants opened four pages on one brand's own domain across thirty answers, quoted them, and named that brand in none of them.