I've been taking the suggested dose of 3 drops per day for over two years to support my thyroid as it's underactive and this product has helped enormously with my energy levels and overall health. When I take it, I also drink a pint size glass of filtered water as advised by Dr Group. I also eat 2 brazil nuts because they are high in selenium which also works symbiotically with this product to support thyroid function. After increasing my levels of iodine with this product I decreased my usage to about 4 times per week. The first year I took it, I literally didn't get any colds or infections or bugs. The second year, I did fight off some winter colds but quickly!