Some motors need a mixture of gasoline and oil in order to work. With only gasoline the motor won't work, or it will sooner or later collapse. With only oil the motor won't work at all. When the ratio of the volyme of gasoline to the volyme of oil is incorrect the motor won't work, or it will work more or less badly, or it will crash sooner or later. Only the correct ratio will make the motor work properly, if all other necessary conditions are met. By motor I mean of course the human body or some part of the human body, and by the oil and gasoline I mean any two substances that the body or the particular part needs for some good reason. Now, please correct me and tell me that this analogy of mine is incorrect or partly incorrect, and then convince me that it's harmless to take sup plements, or at least some of them. /Fredrik