Lastly, Purity. Chlorella has a natural capacity of binding with heavy metals and other toxins in the environment. We use chlorella partly for the same purpose, ie, to bring out toxins in our body. If chlorella is already saturated with toxins during the processes of growing and cell wall treatment, its binding capacity will be less to bind toxins in our body. It is much like a sponge full of water that will not further absorb any more water. We need chlorella to clean our body at cellular level as much as it possibly could before our cells in body could take in nutrients. In other words, chlorella's nutritional function should go hand in hand with detox and in order for chlorella to offer the benefits of nutrition, it should first be pure and free from contaminants. Prime Chlorella has the best standard of detection limit for heavy metals and is regarded as the purest chlorella.