depends on what ails you
if you have candida, look for product with anti-fungal herbs
if you have worms, buy a product with
Wormwood , Green
Black-Walnut Hull and Cloves
if you have bacteria, make sure it contains anti-bacterial herbs
if you have viruses, get one that detoxes viruses
Iodine will help to fortify your immune system against all of them, help your body elminate the toxins that are making you vulnerable to reinfection, and diminish their stronghold.
If you have big worms, you may need a product that paralyzes them so they don't scatter.
My personal favorite protocol is Experience and Clear by Awareness Corporation.
Take one Experience at night for a few days.
Then add a Clear first thing in the morning, on an empty stomach.
After a few days of taking them both, increase the dose to two and two.
Then three and three, four and four, five and five.
Take for thirty days, then do routine maintenence every 90 days, or as needed.
Experience bulks you up and cleans out your colon. Clear kills the parasites.
You take Experience first to get your guts moving regularly before you start the killing.
Humaworm is another good product. It gets great reviews from most everyone who tries it. It's less expensive, and you don't have to become a MLM member to buy it.