{"ok":true,"entry":{"slug":"hibiscus","kind":"supplement","name":"hibiscus","aliases":["Hibiscus sabdariffa","roselle"],"brands_sg":["Frontier Co-op","Starwest Botanicals","Swanson Vitamins","Solaray","Cederberg Tea Co"],"class":"botanical","tags":["heart"],"use_for":"modest blood-pressure lowering in trials, mostly small","use_after":null,"use_duration":null,"take_with":null,"pros":["meta-analysis found ~7 mmHg lower systolic vs placebo","biggest effect in those with higher baseline BP","no added adverse effects up to 10 g/day in trials"],"cons":["very high heterogeneity across trials (I2 = 95%)","no dose or duration can be proposed yet","trials are small and few in number"],"dose_note":"trials used doses from 15 mg to 9 g a day; the review concluded no dose or duration can be proposed yet","dosage":{"ul":null,"unit":"g","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":["already on blood-pressure medicine — ask your doctor first","HSA does not list it, and that list is not exhaustive"],"clashes":[{"src":["ellis2022"],"note":"trials found BP reductions similar to medication; combined use not studied","with":"blood-pressure medicines"}],"sources":[{"id":"ellis2022","url":"https://europepmc.org/article/PMC/PMC9086798","label":"A systematic review and meta-analysis of the effects of Hibiscus sabdariffa on blood pressure and cardiometabolic markers (Nutrition Reviews 2022)","quote":"Hibiscus exerted stronger effects on systolic BP (−7.10 mmHg … I2 = 95%) than placebo … the magnitude of reduction greatest in those with elevated BP at baseline … Hibiscus induced reductions to BP similar to that resulting from medication","accessed":"2026-08-27"},{"id":"ellis2022_dose","url":"https://europepmc.org/article/PMC/PMC9086798","label":"Ellis et al. 2022 — hibiscus doses studied, limits of the evidence and adverse effects","quote":"Doses of hibiscus ranged from 15 mg to 9 g/day … not possible to propose a dose or duration for hibiscus treatment to affect lipids, BP, or FPG … No other adverse effects … at doses up to 10 g/day","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":"This list is not exhaustive. Dealers should continue to: Conduct thorough safety assessments of their products","accessed":"2026-08-27"},{"id":"iherb_sg","url":"https://sg.iherb.com/c/hibiscus","label":"iHerb Singapore — category listing, default order","quote":"Frontier Co-op · Starwest Botanicals · Swanson Vitamins · Solaray · Cederberg Tea Co","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."}