This extract concentrates resveratrol from Polygonum cuspidatum (Hu Zhang). Standardization delivers more resveratrol and better absorption than raw herb powders.
People use it for antioxidant support. It also aims to support joint comfort and healthy circulation, though human data on these uses is limited.
Take the extract with a meal containing fat to improve absorption. Doses vary by product concentration. The extract contains oxalates; in very high doses, oxalates may challenge kidney health in susceptible people. The extract can also interact with certain medications, so check the product warnings.