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Equisetum Arvense Powder
Equisetum Arvense Powder
Moderate concern
Field horsetail contains thiaminase, which can degrade vitamin B1 (thiamine). Long-term high intake may cause thiamine deficiency.
Found in
2 products
What it is
Powdered field horsetail (Equisetum arvense), a herbaceous plant used in herbal preparations.
Used in herbal teas and dietary supplements; not a common food ingredient.
Why it's flagged
- thiaminase activity (vitamin B1 degradation)
- potential trace nicotine contamination
- not classified as a food in most jurisdictions
What regulators actually say
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Regulatory status
United States — FDA
Not a recognized food additive; sold as botanical/dietary ingredient.
European Union — EFSA
Not authorised as a novel food; some traditional herbal medicinal product use under EMA.
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