3-Guanidinopropionic acid is a creatine and GABA analog found in mammalian blood plasma, erythrocytes, urine, liver, kidney, and aorta. 3-Guanidinopropionic acid has been used to study endothelial cell contribution in wound healing, and as a hyperglycemia reliever in animal models.A creatine and GABA analog found in mammalian blood plasma and erythrocytes. 3-Guanidinopropionic acid is a creatine and GABA analog found in mammalian blood plasma, erythrocytes, urine, liver, kidney, and aorta. 3-Guanidinopropionic acid has been used to study endothelial cell contribution in wound healing, and as a hyperglycemia reliever in animal models. A creatine and GABA analog found in mammalian blood plasma and erythrocytes.