Response to #8
8. Symphytum officinale has been used as a feed and forage crop for centuries without incident.

Cheeke PR, Carlsson R: Nutritional reports International 18(4):465-472, 1978
Evaluation of several crops as sources of leaf meal: Composition, effect of drying procedure and rat growth response
This study suggests benefits of consumption of S. officinale and does not implicate comfrey as a liver toxicant.

Comfrey used in its whole form is safe.

Lawrence D Hills Comfrey- Past present and future 1976
A test at the Fujisawa Farm of the Nihon Agricultural University in Japan showed that adult pigs do well on 8 to 9 kg (17-19 pounds) of green comfrey leaf per day. This means replacing 30 percent of the meal with cut comfrey. The University report states a noticeable result was the improved health of the pigs fed on comfrey not only from the allantoin which banished scouring but better mineral balance. This was also observed an the Devon farm institute..

Comfrey has been used as a feed crop for animals without incident, these were animals that consumed large amounts of comfrey for most of their lives.

Lawrence D Hills Comfrey- Past present and future 1976
Experience gained over many years with feeding cattle and horses on comfrey in different parts of the world has failed to produce any evidence of an acute reaction. Equally well there is an absence of any direct evidence of liver tumors of the chronic reaction in comfrey fed animals having been observed in slaughter houses.

No liver problems resulted in feeding farm animals comfrey in large amounts.
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