I don't have blood cloting in legs, but my bone marrow biopsy showed I could get it. I had painful varicose veins in my thighs. Because I react different to some medications my doctor suggesting I try Horse Chestnut Seed Extract. I researched it on the enternet and found that the Chinese have been using it for 500 years. It is a vein constrictor and strengthens them so that blood does not pool in the veins. Ask your doctor about trying it.