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Bracken fern harms horses by breaking down which vitamin?

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  1. Vitamin C
  2. Vitamin A
  3. Thiamine (B1)

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References

  1. Bracken Fern, ASPCA Toxic and Non-Toxic Plants www.aspca.org/pet-care/animal-poison-control/toxic-and-non-toxic-plants/bracken-fern Checked 2026-10-10.

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