A supplement can look plant-based and still hide an animal-derived capsule....

https://brooksssuperop-ed.tearosediner.net/should-i-trust-vegan-claims-without-a-third-party-certification

A supplement can look plant-based and still hide an animal-derived capsule. This article shows you how to spot gelatin versus HPMC, why “vegan” claims don’t have a federal definition in the U.S., and what third-party marks can—and can’t—tell you