Can be used as a test to ascertain if zinc levels are sufficient and also as a zinc supplement to ensure zinc is maintained at a healthy level. To test zinc levels, hold 10ml of the liquid in the mouth for ten seconds. One of four taste responses will occur - 1. No specific taste; 2. No immediate taste but then a "dry mineral", "furry" or "sweet" taste; 3. An immediate and definite taste (not unpleasant) that intensifies; 4. An immediate, strong, unpleasant taste. If 1 or 2 is experienced, zinc levels are deficient; 3 indicates zinc levels could be further optimised, 4 indicates an adequate zinc level. As a zinc supplement, take 5mls three times a day at least two hours before or after meals. Each 10mls contains 59mg of zinc sulphate. It is recommended zinc tests be taken once a month. 200ml bottle