Because it's literally a polymer of lactic acid? It's safe enough that they use it for medical implants because its degradation products already exist in the bo

Because it's literally a polymer of lactic acid? It's safe enough that they use it for medical implants because its degradation products already exist in the body? (Or is this a sarcastic response along the lines of "didn't you know it contains dihydrogen monoxide, a chemical widely used in nuclear reactors and military applications!"?)