You're right to be concerned, absolutely. Iodine is one of the trickier minerals to get right dosage wise. It feeds the thyroid and it's definitely one of those things where too much is toxic. Too much of a good thing is the same as taking a bad thing! argh! and Iodine has a small threshold for error.

The problem is it is so insidious. A deficiency does terrible things throughout the entire body, including infertility. An overdose tends to just have one noticeable affect: an acne-like rash on the face/jaw. Lots of teensy tiny bumps as if the pores are goose-bumpy. When you see that, you know you've eaten too much seaweed. ;) If you don't see it, you could end up damaging your thyroid temporarily.

When people talk about using Iodine to take out Giardia, they're usually talking about adding Iodine to water in order to purify it. to have that same principle work in the body is a huge longshot. The only time I ever used Iodine to take out the baddies is when backpacking, drinking from a stream, and even then we looked for something better, less toxic over time.

Well, with Oxypowder you don't have to worry about it as much because the oxidation is hapepning inside the bowels, not the bloodstream.

Antioxidants strip the body of free-radicals, which are loose Oxygen atoms (finally got a chance to look that up and make sure LOL!). :)

Oxypowder is designed to release lots of oxygen atoms, but inside the intestines, where they will react with impacted fecal matter to dissolve it. I guess if one was concerned about the oxygen ultimately ending up in the bloodstream - which is theoretically possible - then you WOULD want to up your intake of antioxidants.