HomeoPet medicines are safe because all of the ingredients are at 6c & 30c potency. This measures how dilute an ingredient is. 1c means that this particular substance has been diluted at a ratio of 1 to 100. 2c means that this particular substance has been diluted at a ratio of 1 to 10,000. 3c means that this particular substance has been diluted at a ratio of 1 to 1,000,000. Each successive c adds 2 zeros to the end number, making it safer with every c.