iodine

Ah, iodine. I've used it in airports, hotels, cafes - it's great.

Halogens are fluorine, chlorine, bromine, iodine. All common and cheap.

Chlorine is available in quantity, but fluorine, bromine, and iodine are not. Bromine and iodine are actually quite rare - there's more uranium than either of those.

If sanitizing your underarms was sufficient to get rid of odor and sweat indefinitely, then a big iodine swab would do the job faster and even cheaper.

Other minerals such as Magnesium, iodine and selenium have been shown to have a positive effect on mental health but are not sourced well enough in modern diets. Also indicated for energy and mental function are B Vitamins.

The relevant radioactive isotopes are mainly caesium 137, iodine 131, and strontium 90 [1]. When they decay into other elements, they release beta- and gamma radiation, which can damage nearby cells if ingested into the body.

The article treats the belief in supplements entirely as a case of well-nourished people pursuing quack fixes, ignoring scientifically credible practices such as food fortification using iodine and folic acid, the widely-known connection between vitamin C and scurvy, the use of iron supplements to treat anemia, and the historical experience with real malnutrition. The article makes it sound like a ludicrous idea that snuck into the public consciousness via the senility of Linus Pauling in the late 1960s, but vitamin supplementation makes much more sense as an attempt to continue applying a historically successful formula of improving human health by identifying previously unrecognized dietary deficiencies and correcting them.

Here's a useful comparison: Before we were iodizing salt, most people were actually in "the middle" of iodine-consumption. Anywhere from "nearly none" to "tons and tons" was "the middle"--your body can work miracles to create homeostasis from random inputs. But some people were getting no iodine at all, and these people would get very sick. So we added just a little bit of iodine to salt. The iodine-deficient people--the people who were previously getting utterly no iodine--stopped getting sick, because now they were getting a little bit of iodine, and that was enough. Everyone else was getting slightly more iodine--but this didn't push anyone from "getting a tolerable amount of iodine with the excess just excreted" to "having a hyperiodine problem." There was nobody exactly one dose away from having too much iodine, because we just don't consume that much iodine.