Ayurveda's earliest theories are supported by empirical data. Ayurveda is more than just a collection of conventional practices. Every decision about treatment, it demands logic and evidence of causality. Ayurveda does not acknowledge the change impact.
Four major categories are used by Ayurveda to describe evidence in the context of Pramana. Pramana is a Sanskrit word that literally translates to "means of learning" and "correct perception".
The Pratyaksha, or proof derived from precise and direct observations. This is pretty comparable to experimental proof.