[anonymous]

Hope this helps http://skeptvet.com/Blog/2013/06/there-is-no-natural-or-holistic-heartworm-prevention-or-treatment-proven-to-be-safe-and-effective/ excerpt below, click on link for full article and comments

The AHS is also very clear about alternative therapies for this disease: “No “natural” or herbal therapies have been shown to be safe and effective prevention or treatment for heartworm disease.” And fortunately, many proponents of alternative therapies also recognize that no CAM therapies have been shown safe and effective for preventing or treating this disease. The most popular veterinary herbal medicine textbook states, “The authors do not recommend substituting an unproven herbal formula for effective conventional therapy.” Even as radical a proponent of alternative therapies as Dr. Karen Becker at mercola.com grudgingly agrees that,“treatment for heartworm infection is one area where conventional veterinary medicine offers valuable options [and] is preferable to leaving the dog untreated, or using unproven, alternative methods that may have no effect or even be harmful.”
Unfortunately, there are still plenty of unscrupulous companies, and sadly even veterinarians, willing to exaggerate the risks of conventional prevention and treatment and claim that unproven alternatives are safe and effective. Below is a long list of sites promoting unproven methods of preventing or treating heartworm disease. None of these have been demonstrated to be legitimate or reliable, and trusting your dog’s life to any of them is a dangerous mistake.