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Table 2 Leucine content of protein sources for studies that used a protein ingestion timing method

From: Protein timing and its effects on muscular hypertrophy and strength in individuals engaged in weight-training

Research study Protein used Leucine content Reached 3g Threshold for Leucine
Hoffman et al.[31] 42 g of a proprietary blend of protein (enzymatically hydrolyzed collagen protein isolate, whey protein isolate, and casein protein isolate) 3.6 g Yes
Hoffman et al.[32] 42 g of a proprietary protein blend (enzymatically hydrolyzed collagen protein isolate, whey protein isolate, casein protein isolate, plus 250 mg of additional branch chain amino acids) 3.6 g Yes
Cribb et al.[33] Whey protein, creatine and dextrose mixture based on individuals bodyweight 3.49 g1 Yes
Verdijk et al.[34] 20 g of casein split into two 10 g servings pre- and post-workout 1.64 g total in 2 servings2 No
Hulmi et al.[35] 30 g whey split into two 15 g servings pre- and post-workout 3.4 g total in 2 servings No as only 1.7 g were given at a time
Andersen et al.[36] 25 g of a protein blend (16.6 g of whey protein; 2.8 g of casein; 2.8 g of egg white protein; and 2.8 g of l-glutamine) 2.29 g 2,3 No
Elliot et al.[37] 237 g of whole milk 0.639 g No
Hartman et al.[38] 500 mL of fat-free milk 1.35 g No
Wilkinson et al.[39] 500 mL of fat-free milk 1.35 g No
Rankin et al.[40] Chocolate milk based on bodyweight Unknown Unknown
Josse et al.[41] 500 mL of fat-free milk 1.35 g No
  1. 1 3.49 g is based on the amount of leucine that the mean weight (80 kg) of the participants in this study.
  2. 2 Leucine content of casein received from Tang et al.[42].
  3. 3 Leucine content of egg white received from Norton et al.[43].