Negative ions in fact, accurately said that the instrument is not a cure, because it is only to adjust the human body balance. In fact, people get sick, is the original is physiological functions out of balance. When the body's functions are balanced, a lot of chronic diseases, the human body adjusts itself.
Here, I can talk about my own experience.
The effect of negative ions on the human body is different because of individual differences. Leaves can't even find exactly two.
Scalded burns category, the same day can feel the more obvious effect.
Diseases of the respiratory tract effect is generally about a week to have an improved response.
Sleep is generally within a week can feel more obvious.
Cervical spondylosis fast takes a month.
For one or two stages of hypertension effect is also quite good, but very slow.
Negative effect now so many years have not found. There is just a rebound, and if you know Chinese medicine, you know this.
If the owner is interested, I will give you the truth about your concerns.
ps: the concentration is too large for the human body is not harmful, and is just the opposite! It's just not advisable to inhale it for a long time at once.