Botanical Support for the Prostate Herbal Supplement Approved by Michael Tierra L.Ac, O.M.D Pumpkin seeds have been used historically to provide nourishing support to the prostate. They are rich in zinc, which is vital for normal prostate function. Unlike many other pumpkin seed oil supplements, Planetary Herbals Full Spectrum Pumpkin Seed Oil is cold-pressed without the use of toxic chemical solvents.