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Gambir Sarawak is an astringent bark from a shrub called Uncaria Gambir in Borneo. The scientific name of Gambir Sarawak is Uncaria Gambir. It is a herb found only in Sarawak, Borneo. It has been used extensively as the natural herb for premature ejaculation treatment and last longer in bed. Gambir Sarawak is an all-natural premature ejaculation poduct made of 100% herbal material. It is safe, odourless, effective and affordable.