This site states this specific disclaimer directly, attached to its cited sources: these citations concern the individual ingredients, not a clinical trial of the finished Gelagen gummy, which we could not locate.
This addresses evidence quality specifically — the existence of a finished-formula trial — distinct from the separate question of whether individual milligram amounts are disclosed, which this site covers in its own dedicated post.
Worth reading these as two separate transparency gaps this site names: no finished-product trial located, and no individually broken-out milligram amounts located — both real, but distinct findings.