This is work, 1st helped reduce the amount of fleas and alongside some herbal products (to repel fleas) and hoovering, steaming the home, spraying herbal stuff around the home, it appeared to work.

This collar is very soft rubbery plastic but goes on like a cable tie - once it is on you cannot loosen it or remove it without cutting it off. This seems quite dangerous should it get caught on something. The design needs changing to a quick release. The product has a very strong smell which makes your cat and your house smell very floral. If you have a cat that hides, you literally could smell which room it is in! It must smell completely overwhelming to a cat. Luckily ours is very greedy so it is not putting him off his food. I am not sure how much the collar is helping with the fleas. Our other cat has flea allergy dermatitis so anything we can do to reduce fleas will help him. I didn't want to use this collar on him in case it aggravated his skin so used it on our other cat instead. We are using a range of measures all at once so not sure how much this is helping.

My cat suffered reacted to standard flea treatments with scabs and itchy scales along spine. Since using this collar skin is great and all irritation has cleared up.