Ephedra / Ephedrine
Ephedra sinica · Má Huáng 麻黄
A weight-loss stimulant banned after deaths and strokes.
Banned / Harmful evidence
☠️Banned & Harmful
Evidence tier
Banned / Harmful
Research weight
Not supported
Citations
16 verified / 16
Classification
Banned & Harmful
⊘
What the evidence says. Linked to serious harm and/or banned in sport and many jurisdictions. Listed for awareness and safety only — NOT a recommendation.
⚠
Health warning. Ephedra-containing weight-loss/energy supplements were banned by the FDA in 2004 after reports of heart attacks, strokes, seizures and deaths. The modest weight-loss effect does not justify the cardiovascular risk.
What is Ephedra / Ephedrine?
Ephedra / Ephedrine (Ephedra sinica · Má Huáng 麻黄) is a banned or harmful substance marketed for weight loss. NutriDex grades the human evidence as Banned / Harmful. Ephedra (má huáng) is a stimulant herb whose ephedrine alkaloids raise heart rate and blood pressure. It was hugely popular in weight-loss and 'energy' supplements until mounting reports of serious cardiovascular and neurological events — including deaths — led the FDA to ban ephedrine-alkaloid supplements in 2004. Evidence shows only modest short-term weight loss, with a clear increase in adverse effects. Its ban is a landmark supplement-safety case.
Marketed Claims (unproven)
✕(Claimed) weight loss
✕(Claimed) energy & performance
Dosing & Compounds
Use & Legality
Banned in dietary supplements (US, 2004). Not recommended for weight loss or energy at any dose.
Active Compounds
Safety & Cautions
⚠ Heart palpitations, dangerously high blood pressure, arrhythmias, heart attack, stroke, seizures and death have been reported. Risk rises sharply when combined with caffeine or other stimulants. Banned in dietary supplements in the US; tightly restricted elsewhere. Educational only — always check with your doctor or pharmacist before combining Ephedra / Ephedrine with any medicine.
Evidence & Risk Findings ★ 16 studies
meta-analysis
Frontiers in Pharmacology 2024 (systematic review/meta-analysis)
✓ Full text
Meta-analysis of 16 RCTs of ephedra-containing oral medications showed significant BMI reduction (~1.5 kg/m2) for weight loss, with no significant difference in adverse events vs control (RR 0.99) within supervised dosing.
Meta-analysis
Cho 2024
✓ PubMed
Meta-analysis of 16 RCTs found ephedra-containing oral medications reduced BMI by a mean of 1.5 kg/m2 (95% CI -2.46 to -0.54) with no significant difference in adverse effects vs control (RR 0.99, 95% CI 0.80-1.21) when dosed under medical supervision.
meta-analysis
Hong 2021 (Pharmaceuticals, meta-analysis)
✓ Full text
Meta-analysis of 10 RCTs found ephedrine-containing products produced modest weight loss (MD -1.97 kg) and improved lipids vs placebo, but raised mean heart rate by ~5.76 beats/min.
Meta-analysis
Yoo 2021
✓ Full text
Meta-analysis of 10 RCTs found ephedrine-containing products produced greater weight loss than placebo (mean difference -1.97 kg, 95% CI -2.38 to -1.57) but raised heart rate by 5.76 bpm (95% CI 3.42-8.10), warranting cardiac monitoring.
Meta-analysis
Yoo et al. 2021 (Pharmaceuticals)
✓ PubMed
Meta-analysis of 10 placebo-controlled RCTs of ephedrine-containing products: greater weight loss (MD -1.97 kg; 95% CI -2.38 to -1.57), favorable lipid changes (higher HDL, lower LDL and triglycerides), and no significant BP change, but heart rate increased by 5.76 beats/min (95% CI 3.42-8.10).
Guideline
FDA Final Rule 2004
✓ Source
Banned dietary supplements containing ephedrine alkaloids as posing an unreasonable risk.
RCT
Boozer et al. 2002 (Int J Obes)
✓ PubMed
6-month double-blind placebo-controlled RCT (n=167) of herbal ephedra/caffeine (90/192 mg/day): greater weight loss (-5.3 vs -2.6 kg, P<0.001), reduced body fat and LDL, increased HDL; heart rate rose 4 bpm but cardiac arrhythmias were not increased.
RCT
Astrup et al. 1992 (Int J Obes)
✓ PubMed
24-week double-blind RCT (n=180) showing ephedrine/caffeine (20/200 mg t.i.d.) produced significantly greater weight loss than placebo (16.6 vs 13.2 kg, P=0.0015), whereas ephedrine alone and caffeine alone were no better than placebo, demonstrating synergy. Side effects were transient.
Safety / toxicology
Adverse-event reports
✓ PubMed
Heart attack, stroke, seizure and sudden death associated with use.
toxicology review
LiverTox: Ephedra (NIH NCBI Bookshelf)
✓ Full text
NIH toxicology review documents ephedra/ma huang as a cause of clinically apparent hepatocellular injury, including massive necrosis and rare acute liver failure, with cases still reported from Asia.
registry-based pharmacoepidemiology study
Hodges 2008 (Am J Epidemiol, case-crossover)
✓ PubMed
Registry-based case-crossover study of 257,364 users (2,316 cardiovascular events) found prescribed ephedrine/caffeine was not associated with a substantially increased risk of serious cardiovascular outcomes (adjusted OR 0.95, 95% CI 0.79-1.16).
journal letter / population surveillance
Zell-Kanter 2015 (NEJM)
✓ PubMed
U.S. poison-center analysis found ephedra-related calls fell from a peak of 10,326 in 2002 to 180 by 2013, with poisonings causing major effects or death declining by more than 98% after the 2004 FDA ban.
case report
Ventricular arrhythmias in athletes (case report)
✓ PubMed
Case report of two competitive athletes who developed ventricular arrhythmias after long-term ephedrine use, with myocardial structural changes promoting re-entrant tachyarrhythmia.
case report
Marathon runner rhabdomyolysis (case report)
✓ PubMed
Case report of an amateur marathon runner who developed ephedrine sport-supplement toxicity with subsequent rhabdomyolysis.
Study
Shekelle 2003 (JAMA)
✓ PubMed
Modest weight loss but significantly increased psychiatric, autonomic, GI and palpitation side effects.
authoritative body
NCCIH: Ephedra (NIH)
✓ Source
NIH's National Center for Complementary and Integrative Health states ephedrine-alkaloid supplements produced only modest short-term weight loss but caused serious harms (high blood pressure, heart attack, seizure, stroke, psychosis) even at low doses and brief use, and remain banned and unsafe.