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Herbal Dewormer Shown Ineffective

08 August 2014

US – A herbal dewormer on sale in the US has had its efficacy questioned after scientific trials concluded it was an ineffective product.

Feacal eggs counts showed the product was failing to tackle parasites in goats at Delaware University.

Two studies from Delaware have followed several aiming to test the effectiveness of commercially available herbal dewormers in recent years, according to small ruminant expert Dr Dahlia O’Brien, Virginia State.

“So far, scientific studies evaluating commercial, non-chemical dewormers have found that they fail to reduce fecal egg counts in sheep and goats,” said Dr O’Brien.

“The results from these two studies also supports that at the recommended dose and under the conditions of the studies, Hoegger’s Herbal Wormer was not an effective dewormer.”

Some producers claim that, when used with other parasite control methods such as pasture rotation, herbal wormers have been effective. 

The industry acknowledges that this could be helpful when dealing with resistance to chemical products, 

The product contains dried plant blend including wormwood, gentian, fennel, psyllium and quassia.

Dr O’Brien explained that most reports of each ingredient being capable of reducing internal parasites are ‘anecdotal and not supported by scientific data’.

One problem could be with administration and dosage, she warned.

“These products contain varying amounts of dried plant materials and doses that might not be enough to offer effective control.

“Therefore, herbal products alone should not be relied on for controlling/treating internal parasites. If their use is desired, they should always be combined with other integrated parasite management techniques.”


Michael Priestley

Michael Priestley
News Team - Editor

Mainly production and market stories on ruminants sector. Works closely with sustainability consultants at FAI Farms.