This stuff is hands down, the most amazing product I have ever come across. I notice a difference in my overall health when I use it. It takes me about three days to adjust to it. I do start to feel sluggish, tired, and I have runny stools, runny nose, and flu like symptoms around the third or fourth day but then everything becomes normal. I believe it is because the diatomaceous earth is detoxing everything from my body. I can't speak for anyone else but for me, it improves my digestive system, my nails, skin, and hair are much healthier, and I have a lot more energy. I notice the energy levels because I usually drink 2-4 cups of coffee a day but when I am taking the DE, I can only drink 1 because my energy levels are much higher. It also seems to curb my appetite and I don't eat as much, and I get full faster. It reduces the bloat and water retention I often have as well. I also use it for my dogs, they are on the same schedule as me. We take it for 30 days they we take a break for 30 days then back on for 30 days. They are so much healthier as well. They also experience some minor detox symptoms also - same as mine, runny stool, sluggish, and runny noses around day 3/4 but then it goes away and they have a ton of energy after that. We recently moved to TN and encountered a serious flea infestation and this was how I was introduced to DE. NOTHING we used worked! NOTHING! And I refuse to put any chemicals on my dogs. My poor dogs had flea bites so bad on their lower backs they were scabbed, and that was with daily bathing and combing. IT WAS INSANE! I would bathe them and literally watch the fleas run and hide inside their eyes, ears and anal area. I literally cried because nothing was working. I bought some DE and dusted them down and bathed them with organic, chemical free, flea and tick shampoo the next day. Every single flea on them was dead! I was amazed! I am not exaggerating, they were all dead! Then we dusted the house, floors, rugs, bedding, mattresses, closets, and furniture - yes, it was a dusty mess (use a dust mask and make sure nobody, including your animals, are in the house when you do it, the dust really does irritate eyes and nose) but it was better than dealing with fleas. After three days we vacuumed and washed everything. Additionally, we sprayed the fenced in dog area of our yard with a mixture of DE and water - every three days we treated the yard. It was a lot of work but well worth it because it got rid of all of them. You do have to work through the flea cycle though, so we dusted them down and let it stay on them for three days them bathed them - we did this for 8 weeks to make sure we caught all the the ones that may hatch from any eggs they laid. Vacuuming daily and washing bedding once a week also helped. I do keep some in their dog beds all the time now. It also got rid of our spider, cricket , hornet, and ant problem. That was a bonus because we were not expecting that. I told my neighbor about it because they moved here a few years ago and they have not been able to get ahead of the fleas in their yard, and their house since. They use the harsh chemicals on their dogs and still have problems. They treated their house, dogs, and yard, and have been flea free since. This stuff really works. You do have to maintain everything though. Just because it works doesn't mean it will prevent them from reoccurring. The only time we see a flea on our dogs now is when we take them to someone else house or to the groomer, or vet, where other pets may have them. However, we just got into the routine of dusting them down before we bring them home then bathing them the next day. We also use an herbal flea collar and herbal topical as a preventative. Like I said, it is more work but we refuse to use chemicals on our pets or on ourselves. Everyone is different but the only caution I have other then breathing the dust, is for my dogs, I don't leave it on them more then 3/4 days because it tends to dry out their skin and they get itchy, dry skin. The same with my skin, it will dry it out so after bathing them I rub some organic coconut oil into their skin and coat and works great.