It shows that extract of PmT can lengthen the average lifespan of Drosophila melangaster obviously, and decrease the lipofuscin and LPO content of salivary gland cell.

By using extract of Polygonum multiflorum leaves, adopting the external application test,and taking the water content of cuticle and lipofuscin content of horn cells as targets, the authors study the effect of PmTe on the stable state of skin.