This is the difference between particle (colloidal) and Field (energy frequency) Science
Many substances have no known limits, and some like mercury and formaldehyde (like in vaccines) the toxicity is any measurable amount.
I will add again its been more than 15 years in the testing. We arent about testing what it kills, but about Physician, first do no harm, and none has been reported so far which is more than can be said for 2 wire degrading silver solutions.
AND particle Science cant test for energy fields except on the mars and the moon but NASA is a top secret military project of which I have stated that US military research labs use "field Science" not particle science.