| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Angelica archangelica | Plant | -- | -- | Pakistan Encyclopedia Planta Medica. 1986. | |
| Annona muricata | Plant | -- | -- | * | |
| Apium graveolens | Root | -- | -- | * | |
| Apium graveolens | Leaf | -- | -- | * | |
| Apium graveolens | Seed | -- | -- | Wealth of India. | |
| Arachis hypogaea | Seed | -- | 11.0 | -0.8 | * |
| Arctium lappa | Root | -- | 2500.0 | 0.2 | * |
| Arctostaphylos uva-ursi | Leaf | -- | -- | * | |
| Arctostaphylos uva-ursi | Plant | -- | -- | * | |
| Armoracia rusticana | Plant | -- | -- | Newall, C. A., Anderson, L. A. and Phillipson, J. D. 1996. Herbal Medicine - A Guide for Health-care Professionals. The Pharmaceutical Press, London. 296pp. | |
| Arnica montana | Flower | -- | -- | * | |
| Artemisia abrotanum | Plant | -- | -- | * | |
| Artemisia dracunculus | Leaf | -- | 7640.0 | 0.3 | * |
| Artemisia dracunculus | Shoot | -- | -- | * | |
| Artemisia capillaris | Plant | -- | -- | * | |
| Asimina triloba | Leaf | -- | -- | * | |
| Aspalathus linearis | Shoot | -- | 0.66 | -0.7 | * |
| Astragalus membranaceus | Root | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Avena sativa | Plant | -- | -- | Stitt, Paul. Why George should eat broccoli. | |
| Ballota nigra | Leaf | -- | 2000.0 | -0.4 | * |