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Many may wonder why certain Arthur Andrew products are kept proprietary. Proprietary formulas have their pros and cons, and to a client's eyes may have more cons than pros. However, the main issue specific to enzymes is that they are not like vitamins that can simply be measured by weight. The weight to activity ratio can vary greatly from one enzyme's lot to its subsequent lot, let alone factoring in competing products and manufacturers. And since activities are used for enzymes, does anyone really know what 45,000 SPUs of serrapeptase or 1,000 GDUs of bromelain really means once its inside the...