I am prone to kidney stones and have done this successfully three times in the last 8 years. The stones will be gone by the time you finish the asparagus. I let the stone go too long the first time and it took two applications.
My mother-in-law told me about this and I resisted doing that silliness until I finally decided to give it a go. And it went.
Of course if you are diabetic this is a no go.
It wouldn’t have worked. I had a 6mm x10mm stone lodged in my ureter. Had to have lithotripsy. Not just once but twice because the stone was too big.