The broad spectrum formula with diatomous earth is supposed to kill all parasitic worms. And is holistic and completely harmless to my birds and their eggs. I would love to hear if others have used it, here's a link to the site I found, and I'm thinking about purchasing some and what you guys thought first? http://atlantachickenwhisperer.blogspot.com/2009/08/hatchery-special-of-day.html http://www.theholistichorse.com/Poultry.shtml Here's what it says: WormGuard Plus Broad Spectrum for Poultry Finally one wormer for all intestinal worms and parasites. What Is Holistic health Care? Holistic Health Care examines the impact that disposition and environment have on your animals overall health. It differs from conventional care because it doesn't just treat symptoms, but rather seeks the underlying causes of an illness. Holistic Health Care methods (treating the whole animal) are grounded in proven natural principles and practices, many of which have been around for centuries. By focusing on your pet as a whole, made up of both overall health and body we take into account every aspect of the animal's life: quality of diet, which in some cases is very poor, health care, and environment. The main wormer in WormGuard Plus Broad Spectrum for Poultry is of FDA approved Perma-Guard Food Grade Diatomaceous Earth which consist of tiny phytoplankton's mainly composed of amorphous hydrated silicates, of less than 1 %. When parasites come in contact with the tiny particles, there exoskeleton is pierced and the waxy fats and lipids leak from the cuticle of the insect resulting in fluid loss, dehydration and death. And this is done naturally without chemicals.. The Chinese have used Diatomaceous Earth to rid animals and fowl of intestinal parasites for more than 4000 years. Whole Flax Seed Flax Seed is a supplement that many people are not familiar with. However for those that try it, you will never find them without it again. Flax Seeds have an extremely high concentration of Omega 3 and 6 Essential Fatty Acids which are vital for excellent feather condition. You will no longer see broken feathers, slow and improper molting, poor feathering, and dull feathers. Your birds will be sporting glossy feathers all year round and will have softer, resilient combs, wattles and legs. Whole flax seeds are a natural organic substance containing very high levels of lignans called secoisolariciresinol glucoside or (SDG), a phytonutrient. Grape Seed Extract Grape seed extract is reported to have anti-ulcer and antioxidant effect, and its usefulness as a dietary additive. A nutritional supplement for the immune system, circulatory functions, and skin health. WormGuard Plus Broad Spectrum now contains grape seed extract supplement, a special class of water soluble bioflavonoids that are potent antioxidants. In some comparative tests, Grape Seed Extract was found to be 50 times more potent than Vitamin E and 20 times more potent than Vitamin C. Grape Seed Extract prevents the release of histamine from mast cells, maintaining capillary strength. That is why it is now used in WormGuard Plus Broad Spectrum.. Please take a moment and read this vitally important information. You wouldn't be reading this if you didn't love your birds and want the best for them and their health. I know you want your birds to be healthy, sleek and full of vitality , with faster weight gain and greater egg production and omega 3 and 6 fatty acid (from flax seed) fed bird eggs sell for well over twice what other eggs sell for, remember what you put into your birds ultimately ends up on your table as eggs or meat. So please no more treating them with possibly deadly poisons and chemicals to worm them that sometimes make them sick, it is no longer necessary, not since the discovery of my natural WormGuard Plus Broad Spectrum for poultry. WormGuard Plus Broad Spectrum is completely harmless to you and your birds but death to internal parasites. You can now rid them of internal worms and parasites without the use of poisons. Parasites can not develop an immunity to my wormer as they will to chemicals and the birds just love it.