For what application are you using it? I notice you do marathons, which must have some systemic effects?
Huch, I'm very far from running even short distances.. (that was an other person who posted on my profile page)
In Ayurveda very rarely is one herb used in high doses for one application, but in combination and synergy of many other herbs. And depending on these other combinations, for different applications. It's a little bid like orthomolecular medicine, where one doesn't take high dose nutrients in isolation (the pharmaceutical model), but combined with all other nutrients involved in the same metabolic pathways. And often similar combinations for very different indications.
For example Himalaya company uses tiny doses of it - where the other herbs often take the edge off from each other - in the following combination products:
Where some are basically for potency and libido, others against aging, and as a nootropic. But if you insisted on 1 indication in my case for which I started with kapikacchu as an individual herb, then I would choose the most pressing, my male hormone deficiencies.