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Hibiscus

Supplement botanical heart & metabolic
Aka: Hibiscus sabdariffa, roselle
Brands seen in Singapore: Frontier Co-op, Starwest Botanicals, Swanson Vitamins, Solaray, Cederberg Tea Co
Not medical advice. Check with your doctor or pharmacist before you start, stop or change the timing of anything you take.
How to use
What it’s for
Modest blood-pressure lowering in trials, mostly small
Pros & cons
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
Sources
  1. A systematic review and meta-analysis of the effects of Hibiscus sabdariffa on blood pressure and cardiometabolic markers (Nutrition Reviews 2022) · read 2026-08-27
    what it says
    “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”
  2. Ellis et al. 2022 — hibiscus doses studied, limits of the evidence and adverse effects · read 2026-08-27
    what it says
    “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”
  3. HSA — Guidelines on prohibited and restricted ingredients in health supplements and traditional medicines (Oct 2025), Annex A/B · read 2026-08-27
    what it says
    “This list is not exhaustive. Dealers should continue to: Conduct thorough safety assessments of their products”
  4. iHerb Singapore — category listing, default order · read 2026-08-27
    what it says
    “Frontier Co-op · Starwest Botanicals · Swanson Vitamins · Solaray · Cederberg Tea Co”
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Updated 2026-08-29. Every line above traces to a numbered source. Kozen-X is not a medical device and does not give medical advice. It lists what published sources have written down — nothing more. A pair not listed is unrecorded, not cleared. Before you start, stop or re-time anything, talk to your doctor or pharmacist.