Can guanidinoacetic acid really improve the lean meat rate of animals?

as far as I know, guanidinoacetic acid is sold in the market. guanidinoacetic acid is a food additive and health care product for athletes in Europe and America, and there is no potential safety hazard. Moreover, they have done experiments in many pig farms, and the daily weight gain of livestock and poultry has increased by more than 6-8%, and the weight gain rate of fish and shrimp has increased by more than 9-12%. Feed the big pigs 3-45 days before slaughter, that is, feed 5-6 kg, and each fat pig is 3-5 kg longer. Achieve 6% of the effect of Lake.