This site states this directly under its manufacturing-quality section: GMP-Certified, Gluten-Free, non-habit-forming and made following Good Manufacturing Practice standards.
Gluten-free speaks to the capsule's composition, distinct from the non-habit-forming claim, which speaks to the six named nutrients and botanicals rather than any habit-forming compound — worth reading these as two separate, specific claims.
As with any brand-stated claim on this site, worth confirming the gluten-free and GMP-certified statements against your own bottle's supplement facts panel rather than relying on the homepage description alone.