This site states this specific disclaimer directly, right after its own mechanism section: research support exists for the individual botanicals, not for this finished product.
Worth noting this site places this evidence disclaimer directly after explaining its mechanism, not buried later in a references section — worth reading that placement as this site front-loading the caveat rather than hiding it.
This exact concern is expanded on in more depth in this site's own "Six References" post — worth reading both together, this shorter framing and that fuller explanation.
Backed by a 60-day money-back guarantee.
See The Current BreathiZen Offer