It doesn't mention anything about what's in it, so I wouldn't buy it. That 12% can mean a meriad of things. The different ways that different sellers use different meaning for the .. % is really confusing.
I used this before I started making my own. They changed the text on the site though. http://www.ebay.com/itm/3-x-100ml-Lugols-Iodine-original-full-strength-value-...
It used to say 1800 drops per bottle. Now, that's a bit much, I think it's more like 1500 drops. But to say 315 drops is far too little. Don't understand where they get that from. Besides, it makes the math off:
8 mg per drop at 315 drops per bottle make 315*8/1000=2,520 gram iodine/iodide. And there's supposed to be 12 grams in the bottle. 1500 drops works better: 1500 * 8 / 1000 = 12 gram ah! fits exactly!
I now make my own: that way I know exactly what's in it. Besides, it is much cheaper to make your own. https://sites.google.com/site/violienshealth/nutrients/minerals/iodine/calcul...
Calculations were made one year ago, prices have gone up since, but for comparison it still works fine. For 50 mg daily (iodide and Iodine together for comparisons reasons):
Iodoral: USD 0.75 per day
Bought Lugols 12% costs USD 0.17 per day (now 0.18 per day).
Home made Lugols 15% costs USD 0.014 per day.
Home made SSKI USD 0.0094 per day.
You need both Iodide and iodine. But if the body is working well (in which case you would probably not be on this forum), the body should be able to make on out of the other, so in that case SSKI would suffice. I take both though, because my body hardly does anything efficiently.
Besides, Lugols is good on wounds, pimples, to desinfect water, in soup in the fridge to keep it well far longer, ..
SSKI is handy because it holds so much Iodide in a small bottle: almost 50 mg per drop!
I like my Lugols in the original strength, because then, when I add it to cream and such, it doesn't water it down too much. If I want to drink it, I add it to whatever I'm drinking at that time.