I have been taking horse chestnut seed extract supplements for vein health for the past year or so. I had to stop taking it due to an upcoming surgery, and my leg/feet swelling has been so bad since I stopped taking it! It's supposed to help with chronic venous insufficiency, but it makes a huge difference for my idiopathic edema. I forgot how much it helped until I stopped taking it- it probably reduces my symptoms about 80%.
If you want to try it, you can find it on Amazon or at a natural/health foods store. I take the Nature's Way brand, but there are several options online.
Thank you very much for the information! Very helpful.