MCU and GDU units
This enzyme is sometimes listed as MCU units (milk clotting units) or as  GDU units (gelatin dissolving units). One GDU is approximately 1.5 MCU.

Research study
Protease Supplementation Improves Muscle Function after Eccentric Exercise.
Med Sci Sports Exerc. 2009 Sep 2. Buford TW, Cooke MB, Redd LL, Hudson GM, Shelmadine BD, Willoughby DS. Exercise and Biochemical Nutrition Laboratory, Baylor University, Waco, TX.Protease supplementation has been purported to reduce the damaging effects of eccentric exercise and accelerate recovery of muscle function, possibly by regulating inflammation. To determine the effectiveness of protease supplementation in attenuating eccentric exercise-induced skeletal muscle damage and inflammation. After standard physical and hemodynamic assessment and fasting venous blood samples, subjects performed isokinetic extension/flexion of the quadriceps group on a Biodex isokinetic dynamometer. Subjects were randomly assigned to consume 5.8 g daily of either a cellulose placebo or a proteolytic supplement containing fungal proteases, bromelain, and papain for a period of 21 days. After the supplementation period, subjects donated blood samples before performing a 45-min downhill (-17.5%) treadmill protocol at 60% of V O2max. An additional four blood draws and three muscle function tests were performed during the next 48 h. Significant group differences and another strong trend were observed for flexion indicating higher force production in the protease group. Significant group x time interactions were observed, including elevations in circulating eosinophils and basophils in the protease group coinciding with lower levels of serum cyclooxygenase 2, interleukin 6, and interleukin 12 in this group. Protease supplementation seems to attenuate muscle strength losses after eccentric exercise by regulating leukocyte activity and inflammation.

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