A clinical trial found that a 20g dose of soy-pea protein, even boosted with extra leucine, failed to increase muscle-building rates in older men, performing no better and no worse than whey protein since none of the doses were high enough to trigger a response.
1
Whey protein raised blood essential amino acid levels more than plant protein (iAUC 135 vs 99-105 mmol·240min·L-1, P<0.001), but this didn't translate to better muscle building
2
Adding 2g leucine to the soy-pea blend pushed peak blood leucine higher than even whey (567 vs 471 μmol/L) yet still didn't boost muscle protein synthesis
3
Muscle protein synthesis rates were statistically identical across all three groups (~0.034-0.035%/h) and were not elevated above resting baseline levels
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