This site states this directly across multiple sections: stimulant-free, made in the USA, with no artificial stimulants or harsh additives.
The stimulant-free claim positions this formula around traditional botanicals rather than caffeine or similar stimulant compounds, distinct from the separate naturally sourced claim about ingredient origin — worth reading these as two specific, separate points.
As with any brand-stated claim on this site, worth confirming both statements against your own bottle's supplement facts panel rather than relying on the homepage description alone.