Horsetail (Equisetum arvense)

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Silicon in horsetail and comfrey

Horsetail is famous among herbalists as a source of silicon, present in the plant in various forms including the water soluble silicic acid. The plant contains between 5% and 8% silicic acid (Duke). Experiments by Piekos and Paslawaska demonstrated that 55 mg of silicon in soluble form may be extracted in 200 ml of water in which 2.0 grams of Equisetum arvense plant is boiled for 3 hours, for a total yield of 2.75% soluble silicic acid by weight of the original horsetail.

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