What is GFR? Actually, GFR refers to the glomerular filtration rate which is an important indicator of how well your kidneys are working apart from creatinine levels. But for almost all the kidney disease patients, of course, including FSGS patients, they usually have low GFR and the lower the GFR is, the severer the illness condition is. What is more, increased GFR always indicates the gradual recovery of kidney functions. So, all the FSGS patients wonder how to increase GFR naturally for FSGS patients.