The useful part of dose math is often dimensional: converting grams to milligrams, understanding whether a number refers to total extract or an active marker, and checking what a stated percentage actually yields. Those calculations can expose label confusion without pretending to answer what a particular person should take.
For any real-world decision, use the full profile to check the studied population, formulation, evidence quality, medication interactions, contraindications, and uncertainty. A larger body size does not automatically justify a larger supplement amount unless the underlying evidence specifically establishes weight-based dosing.