How long does shilajit take to increase testosterone? Clinical studies show that shilajit can significantly increase testosterone levels after consistent use over several weeks to a few months. In research involving healthy men, daily supplementation with purified shilajit led to notable increases in both total and free testosterone after regular use, with hormone levels remaining stable and safe during this period. While some users may notice minor benefits sooner, the full effects on testosterone typically require consistent, long-term use.