Trapper (below) is right that you should cut down on the dosage. Ever hear the expression: Too much of a good thing? Salt is essential to our survival, but you can kill yourself with it if you ingest a cup or two in one sitting.
As to expense, you can make your own Lugol's cheaply and have enough left over to sell to friends and family for a lot less than they'd have to pay on line. Just Google "make Lugol's" and you'll see Tony's YouTube video. You'll have an initial cost--one of them being a postage scale to weigh the Iodine crystals. I think mine cost about $4 or $5.Your small investment will repay you. I made a batch of Lugol's about 2 years ago, gave some to friends and family and still have plenty for me.