If you use the product in small dosages , and the amount of it in one bottle is large. And, accordingly, one bottle should be sufficient for a period of use for several weeks, then the best option is to prepare the solution by mixing with bactericidal water. Usually in fitness and bodybuilding the average daily amount is from 5UI to 10UI for men and from 2 to 5ME for women, and in one bottle contains either 10UI or 4UI . Proceeding from these figures, one bottle of the product is usually enough for the athlete for several days. And you can use ordinary water for injection without fear of losing the properties of the drug or the risk of spreading bacteria.