Which measurement system may derive drugs from animal sources with varying strengths?

The unit system is specifically designed for measuring various quantities, including the strength of drugs derived from animal sources. In pharmacology, this system allows for flexibility and precision needed to account for the varying potencies that can occur naturally in animal-derived substances. The unit system includes standardized measures that can reflect differences in active ingredient concentrations, addressing the variability in strength that one might find among drugs sourced from different animals or even different batches of the same source.

Other measurement systems, such as the metric system or imperial system, are standard units used for weight, volume, and length, but they do not specifically account for the variability in drug potency inherent in biopharmaceutical products. The cubic system is not a recognized measurement system in pharmacology. Thus, the unit system is the most appropriate choice for addressing the nuances involved in the pharmacological aspects of animal-derived drugs.