| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Pinus gerardiana | Seed | -- | 75000.0 | -0.6 | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |
| Pinus cembroides | Seed | 31000.0 | 37000.0 | -0.7 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Pinus elliottii | Resin, Exudate, Sap | -- | 20000.0 | -1.5 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Pinus edulis | Seed | 30000.0 | 59000.0 | -0.6 | * |
| Pinus pinea | Seed | 56000.0 | 69750.0 | -0.6 | * |
| Piper nigrum | Fruit | 103109.0 | 107091.0 | -2.9 | USDA's Ag Handbook 8 and sequelae) |
| Piper betel | Leaf | -- | 854000.0 | 0.2 | * |
| Piper methysticum | Root | -- | 120000.0 | -4.2 | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. |
| Piper auritum | Leaf | 804000.0 | 822000.0 | 0.1 | * |
| Pistacia vera | Seed | 36500.0 | 5300.0 | -0.9 | * |
| Pisum sativum | Seed | 760000.0 | 793670.0 | 2.2 | * |
| Pisum sativum | Fruit | 880000.0 | 897750.0 | 0.6 | * |
| Plantago psyllium | Seed | 782000.0 | -- | * | |
| Plantago major | Seed | -- | 700000.0 | 1.8 | * |
| Plantago psyllium | Hull Husk | -- | 83000.0 | 1.0 | * |
| Platonia insignis | Fruit | 700000.0 | 723000.0 | -0.2 | * |
| Platycodon grandiflorum | Root | -- | 242000.0 | -3.5 | * |
| Plectranthus amboinicus | Leaf | -- | 944000.0 | 0.7 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Polygonum multiflorum | Root | -- | 800000.0 | 0.2 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Polymnia edulis | Root | 822000.0 | 909000.0 | 0.9 | * |