International Animal Health is proud to introduce the first products proven to decrease the re-infestation of roundworm larvae.

BioWorma® or Livamol® with BioWorma® are not anthelmintics/dewormers.

Both products contain a natural fungus, called Duddingtonia flagrans.

When fed to grazing animals the thick walled spores pass through the digestive system remaining inert (having no effect within the host animal) and out into the manure. When the infective nematode/roundworm larvae become active within the manure, the fungus germinates forming a fungal web that captures, paralyses and consumes infective larvae. As a result, the worm cycle is effectively broken. Anthelmintic resistance has no effect on BioWorma.

BioWorma and Livamol with BioWorma reduce the number of gastrointestinal nematodes (GIN) larvae on pasture, which is significantly greater than a chemical wormer can do within the animal.

International Animal Health Products (IAH – studies showed the average reduction for Horses were 84%.
Efficacious in horses on:

Large strongyles (large red worms), including Strongylus spp., Triodontophorus spp. and Oesophagodontus spp., small strongyles (small red worms or cyathostomes), including Cyathostomum spp., Cylicocyclus spp. and Cylicostephanus spp., Stomach Hair Worm (Trichostrongylus axei), Ascarids (Parascaris equorum), Threadworms (Strongyloides westeri) and Pinworms (Oxyuris equi).

Over 20 years of development and 120+ studies confirm the efficacy of BioWorma.

Horses: Reductions in infective larvae on pasture up to 99% were reported (Fernandez et al., 1999b). Braga et al. (2009) reported up to 73% reduction in eggs per gram (epg) and Larsen et al. (1996) reported large reductions in worm burdens of tracer foals (88% reduction in arterial Strongylus vulgaris larvae, 96% reduction in S. edentatus larvae in flanks and kidneys, plus average 82% reduction in cyathostomes in the mucosa and 71% reduction in the dorsal lumen). Larsen et al. (1996) also reported reduced incidence of parasitosis in tracer foals and more than doubled weight gain. Reductions in larval emergence from coproculture of up to 78% were also reported (Braga et al., 2009)

Published trials by IAH : Field evaluation of Duddingtonia flagrans IAH 1297 for the reduction of worm burden in grazing animals: Pasture larval studies in horses, cattle and goats July 2018

Common Questions

If I feed BioWorma for 3 months will it establish on my farm?

No. Once the fungus has consumed the larvae in the manure it will die.

Is BioWorma affected by seasonal change?

BioWorma is recommended for strategic use during periods when weather conditions are conducive to larval development and transmission onto pasture at temperatures above 40°F (5°C).

Does it affect dung beetles or earthworms?

There are no negative effects on non-target soil nematodes, earthworms, microarthropods, soil bacteria and fungi. Beneficial insects feeding or breeding on manure (e.g. dung beetles, fly larvae) are not negatively affected.

BioWorma and Livamol with BioWorma has now been received and cleared meaning we are now open for business in the USA.

Our first official distributor being Premier 1 Supplies, located in Iowa has stock of Livamol with BioWorma.

We are actively looking for Feedstore and Veterinarian partners; please visit our website ( for contact details.

For further information or questions regarding BioWorma or Livamol with BioWorma, please contact

We would like to thank you all for your interest in BioWorma. Please visit for more information.

BioWorma® and Livamol® with BioWorma®
– Breaks the Worm Cycle –