Pumpkin seeds contain a wide variety of antioxidant phytonutrients, including the phenolic acids hydroxybenzoic, caffeic, coumaric, ferulic, sinapic, protocatechuic, vanillic, and syringic acid; and the lignans pinoresinol, medioresinol, and lariciresinol. Pumpkins seeds also contain health-supportive phytosterols, including beta-sitosterol, sitostanol, and avenasterol. Pumpkin seeds are a very good source of bone-building phosphorus, magnesium. and manganese. They are also a good source of other minerals including immune-supportive zinc and copper and energy-producing iron . In addition, pumpkin seeds are a good source of muscle-building protein.