There is a lot of products selling at Amazon labeled as Negative Ions products.
Mostly made by Chinese companies
These products are usually bracelets, bands, showers and even sex toys.
They claim to improve your health and do wonders.
Scientist experimented with them and discovered that, some of them have nothing special at all, and some have radioactive material.
Most of the tainted are filled with thorium dust, labeled as negative ion dust.
Handling them for a quick period of time would actually be harmless, but wearing them, (as is the intended marketed purpose), will sure do a lot of harm
We may conclude that Amazon would literally sell organs if they could...
(Source Thought Emporium; youtube link below)