The typical recommendation is 1 teaspoon per day, with each teaspoon (5 ml) containing 10 parts per million (ppm) of silver or 50 mcg of silver. This amount is in keeping with the average amount of silver consumed from food and water: roughly 350 mcg per day for most people. However, little in known about the relative absorption and toxicity of colloidal silver, compared with that of the silver naturally present in our diet. Because of the lack of long-term safety or efficacy data for colloidal silver, its use cannot be recommended.