{"ok":true,"entry":{"slug":"horsetail","kind":"supplement","name":"horsetail","aliases":["Equisetum arvense"],"brands_sg":["Nature's Answer","Nature's Way","Swanson Vitamins","Frontier Co-op","Solaray"],"class":"botanical","tags":["skin-hair"],"use_for":"traditional diuretic use; sold as a plant silica source","use_after":null,"use_duration":null,"take_with":null,"pros":["diuretic effect confirmed in animal and clinical trials","one of the richest plant sources of silica"],"cons":["a 2025 review calls it an unfounded hair-loss remedy","a case report links horsetail to low blood sodium"],"dose_note":null,"dosage":{"ul":null,"unit":null,"fda_dv":null,"rda_ai":null,"ul_status":"none_established","population":"general adult","hsa_max_daily":null},"ul_status":"none_established","sg_class":null,"cautions":["low blood sodium — a hospital case report names horsetail as a possible aggravating factor"],"clashes":[],"sources":[{"id":"equisetum_review","url":"https://europepmc.org/article/PMC/PMC7954623","label":"Phytochemistry and Pharmacology of the Genus Equisetum (Equisetaceae): A Narrative Review (Frontiers in Pharmacology 2021)","quote":"the most widespread traditional use of Equisetum is as a diuretic … The most popular species from the Equisetum genus with medicinal use is E. arvense L., whose diuretic effect was confirmed in animal models and clinical trials","accessed":"2026-08-27"},{"id":"silica2024","url":"https://europepmc.org/article/PMC/PMC11641935","label":"The Influence of Horsetail (Equisetum arvense L.) Powder and Horsetail-Based Silica on the Crystallization Kinetics of Polylactide (Materials 2024)","quote":"Another rich source of biogenic silica is common horsetail (Equisetum arvense L.), containing up to 25% SiO2 in the dry matter","accessed":"2026-08-27"},{"id":"alopecia_misinfo","url":"https://europepmc.org/article/PMC/PMC11961141","label":"A Qualitative Review of Misinformation on Alopecia (Skin Appendage Disorders 2025)","quote":"Alternative unfounded therapies which were touted included mineral supplements, biotin, B vitamin complexes, fish oils, shark cartilage, onion juice, rosemary oil, horsetail extract, and saw palmetto","accessed":"2026-08-27"},{"id":"hyponatremia2021","url":"https://europepmc.org/article/PMC/PMC8463020","label":"Case report title, Canadian Journal of Hospital Pharmacy 2021 (title only — no abstract published)","quote":"Hyponatremia Secondary to Decreased Oral Intake and SIADH and Possibly Exacerbated by Horsetail (Equisetum arvense)","accessed":"2026-08-27"},{"id":"hsa_hs","url":"https://file.go.gov.sg/hsa-hs-guidelines.pdf","label":"HSA — Guidelines on health supplements (Singapore), maximum daily limits Tables 4–5","quote":"Table 4: Vitamins Limits … Nutrient Maximum Daily Limit … Table 5: Minerals Limits","accessed":"2026-08-27"},{"id":"hsa_pr","url":"https://file.go.gov.sg/hsa-chp-prohibited-restricted-ing-guidelines.pdf","label":"HSA — Guidelines on prohibited and restricted ingredients in health supplements and traditional medicines (Oct 2025), Annex A/B","quote":"The objective of this guideline is to highlight the substances of concern when used in HS and TM and is not meant to be an exhaustive list.","accessed":"2026-08-27"},{"id":"iherb_sg","url":"https://sg.iherb.com/c/horsetail","label":"iHerb Singapore — Horsetail category page (default best-selling order)","quote":"Horsetail","accessed":"2026-08-27"}],"brand_certs":null,"updated_at":"2026-08-29T16:16:21.812539+08:00"},"disclaimer":"kozen-x is not a medical device and does not give medical advice. it lists what published sources have written down. absence of a record is not the same as safe."}