glycine propionyl l carnitine ncbi Long-term propionyl-l-carnitine supplemention and paradoxical effects on repeated anaerobic sprint performance | Journal of the International Society of Sports Nutrition Glycine as a conditionally essential
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Science 328 , 15661569 (2010)

doi: 10.1097/PCC.0b013e31823f435c
& Shahpasand, K

Complementary Therapies in Medicine

This presents a potential limitation as it is possible that the data on VAS is not normally distributed in RCTs
