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"Poisonous" does not mean deadly. Some manifestations of toxicity are subtle. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard.

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BRIEF: Is blue green algae safe for horses?

Does anyone know what blue green algae is and if it is safe to give a tablespoon to a horse? Its touted to help while line disease repair internally. Articles say foot repairs quicker if a horse is fed this algae.


Sounds like more foo-foo dust being pedalled to horse owners. If the blue green algae is of the wrong species it can poison the horse and even if it is of a relatively innocuous species, the culture can be contaminated with harmful bacteria. Why do people fall for this stuff?