Best Weight Loss Supplements 2026: Proven, Ranked & Reviewed

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By Sarah Mitchell, Certified Nutrition Specialist | April 9, 2026 | 14 min read

Let me be upfront with you: I was skeptical when I first started reviewing weight loss supplements back in my early career. A decade of clinical nutrition work later, I’ve developed a habit of going straight to the research before forming any opinion. And that habit has saved a lot of my clients from wasting money on products that sound compelling on Instagram but have zero clinical support.

In 2026, the weight loss supplement market sits at an estimated $33 billion globally — a number that should make anyone pause. More products, more claims, more noise. GLP-1 mimetics are dominating headlines. Berberine is being called “nature’s Ozempic” everywhere. Thermogenic blends promise metabolic transformation overnight.

The reality? More modest. More interesting. And worth understanding properly.

This guide ranks the best weight loss supplements of 2026 using a three-tier evidence system I built based on peer-reviewed clinical literature. You’ll get honest assessments, actual clinical numbers, and a side-by-side cost-versus-dose breakdown — the kind of information most supplement sites avoid publishing because it makes their products look less impressive.

Short answer: No supplement replaces a caloric deficit and consistent movement. But certain ingredients, at clinically tested doses, do provide a real — if modest — measurable edge.

Table of Contents

  1. How I Ranked These Supplements
  2. Do Weight Loss Supplements Actually Work?
  3. The 3-Tier Evidence System Explained
  4. Tier 1: Strongest Clinical Evidence
  5. Glucomannan
  6. Green Tea Extract (EGCG)
  7. Caffeine
  8. Tier 2: Moderate Evidence
  9. Berberine
  10. Green Coffee Bean Extract
  11. Capsaicin / Capsaicinoids
  12. Tier 3: Emerging / Limited Evidence
  13. Conjugated Linoleic Acid (CLA)
  14. Garcinia Cambogia
  15. Original Data: Price Per Dose vs. Clinical Dose
  16. Best Weight Loss Supplements by Goal
  17. Top Recommended Products
  18. What to Avoid in 2026
  19. Safety & Drug Interactions
  20. FAQ

How I Ranked These Supplements

Before we get into the picks, here’s the exact framework I used:

  1. Clinical evidence quality — randomized controlled trials (RCTs), meta-analyses, and systematic reviews only. No in-vitro data, no animal-only research.
  2. Dosage transparency — does the supplement actually contain what the studies tested? This eliminates probably 60% of products on the market immediately.
  3. Safety profile — documented adverse events, known drug interactions, any FDA or regulatory warnings.
  4. Cost efficiency — price per serving against the clinically effective dose. I built an original comparison table specifically for this guide.

Sources I used include the NIH Office of Dietary Supplements, PubMed meta-analyses, EFSA authorized health claims, and a 2022 Nutrients journal review covering 15+ ingredients across hundreds of trials.

Do Weight Loss Supplements Actually Work?

Yes — modestly, and only for specific ingredients at specific doses.

I know that’s not the answer most supplement ads want you to hear. But let me give you the actual numbers, because they’re more useful than hype in either direction.

A 2021 systematic review published in Obesity analyzed over 1,700 clinical studies. The finding: some people taking evidence-backed supplements reported modest additional weight loss compared to placebo — typically 2 to 5 additional pounds over 8 to 12 weeks.

That number matters. It’s not the 30 lbs in 30 days promise you’ll find on most label copy. But 2–5 lbs over a quarter is real, meaningful, and compounding if sustained. Context matters here:

  • The best-evidenced ingredients (glucomannan, green tea extract) produce on average 0.4–1.4 kg additional weight loss versus placebo
  • Prescription GLP-1 agonists like semaglutide produce 12–15% body weight reduction in clinical trials — supplements simply don’t approach that range
  • Only one OTC weight loss drug is FDA-approved: Orlistat (Alli), a fat absorption blocker — not a dietary supplement
  • Most supplements work through one of four mechanisms: appetite suppression, thermogenesis, fat oxidation, or gut hormone modulation

I think of supplements as 5–10% accelerators on top of a solid diet and exercise foundation. When you have that foundation in place, certain ingredients genuinely move the needle. Without it, they do almost nothing.

The 3-Tier Evidence System

Here’s the framework at a glance:

Tier Evidence Level Examples
Tier 1 Strong: EFSA-approved claim OR 15+ RCT meta-analysis Glucomannan, Green Tea Extract, Caffeine
Tier 2 Moderate: Multiple RCTs, statistically significant results Berberine, Green Coffee Bean, Capsaicin
Tier 3 Emerging/Limited: Small trials, conflicting results CLA, Garcinia Cambogia, Raspberry Ketones

Tier 1 doesn’t mean “magic.” It means the ingredient has cleared a bar of evidence that most ingredients never reach. Even Tier 1 ingredients typically produce modest results — but they’re predictable, real, and supported by independent research rather than manufacturer-funded studies.

Tier 1: Strongest Clinical Evidence

1. Glucomannan — Best Fiber Supplement for Weight Loss

What is glucomannan? Glucomannan is a soluble dietary fiber from the konjac root (Amorphophallus konjac). It is the only non-prescription weight management ingredient with an authorized health claim from the European Food Safety Authority (EFSA), approved at ≥3 g/day in energy-restricted diets.

Clinical evidence: The EFSA doesn’t hand out health claims lightly — their review process is among the most rigorous in the world. Multiple independent meta-analyses back the EFSA position:

  • One meta-analysis reported 0.5 kg additional reduction versus placebo
  • Another found 1.27 kg reduction in overweight adults at 3 g/day
  • EFSA’s authorized claim requires ≥3 g/day taken with 1–2 glasses of water before each meal

How it works: Glucomannan absorbs water in your stomach, expanding to form a viscous gel. This slows gastric emptying, delays nutrient absorption, and triggers fullness signals. It also shows downstream improvements in fasting blood glucose, LDL, total cholesterol, and triglycerides.

Here’s something I always tell clients: glucomannan doesn’t work if you under-dose it. Many products put 1 gram in a capsule and call it a day. That’s not the clinical dose. You need 3 grams split across three meals, taken with plenty of water, every single day.

Dosage: 1 gram before each of three meals, taken with at least 8 oz water.

Safety: Safe at recommended doses — FDA has recognized glucomannan as a safe food additive since 1994. One real risk: esophageal obstruction if taken as tablets without adequate water. Always use powder or capsule form. Take it right, and this risk is minimal.

Monthly cost: $15–25 for the effective 3 g/day dose.

2. Green Tea Extract (EGCG) — Best Natural Thermogenic

What is green tea extract? Concentrated from Camellia sinensis leaves and standardized to epigallocatechin gallate (EGCG) — the catechin responsible for most of green tea’s metabolic effects. EGCG inhibits the COMT enzyme that breaks down norepinephrine, which in turn keeps a fat-burning hormone active longer.

Clinical evidence: A 2022 meta-analysis of 22 studies in Nutrients (Mah et al.) confirmed statistically significant effects:

  • Body weight: −0.40 kg versus placebo
  • BMI: −0.05 kg/m²
  • Body fat percentage: −0.56%

When combined with caffeine — and this is the key finding — the synergistic effect is substantially stronger. That combined stack reduced body weight by approximately 1.38 kg over 12 weeks versus caffeine alone. The Nutrients review described green tea extract as showing “the most plentiful and consistent clinical evidence for weight management benefits” among all common supplement ingredients.

How it works: The EGCG + caffeine combination increases thermogenesis, boosts fat oxidation rate, and raises 24-hour energy expenditure. Studies show GTE can increase metabolic rate by 3–4% and short-term fat burning by up to 17%.

Important safety note: 34 documented cases of liver enzyme elevations have been reviewed by the U.S. Pharmacopeia. The risk is low overall but real. Taking green tea extract WITH food (not on an empty stomach) significantly reduces the risk. This is the one practical rule I enforce with every client who uses GTE.

Dosage: 500 mg EGCG/day, taken with food.

Monthly cost: $20–35 for an effective dose.

Label check: Look for “standardized to ≥45% EGCG.” Many cheaper products list “total catechins” instead — that’s a diluted marker that tells you almost nothing about actual EGCG content.

3. Caffeine — Best for Energy Expenditure & Fat Oxidation

What is caffeine in supplements? Coffee bean extract, green tea caffeine, or guarana — all deliver the same molecule. Caffeine is the most extensively studied thermogenic compound in existence and the active backbone of virtually every commercial fat burner sold.

Clinical evidence: A dose-response meta-analysis of 13 studies confirmed:

  • Significant reductions in body weight, body fat, and BMI (dose-dependent relationship)
  • Thermogenic effect: 100 mg caffeine increases metabolic rate by approximately 3–4% for several hours post-ingestion
  • Fat oxidation increases both at rest and during exercise at 3–6 mg/kg bodyweight

How it works: Caffeine inhibits phosphodiesterase, raising cyclic AMP, which promotes lipolysis (fat breakdown). It also stimulates catecholamine release from the central nervous system — adrenaline being the primary driver of fat mobilization.

The tolerance problem: I tell every client about this because it trips people up. Tolerance to caffeine’s thermogenic effects develops within 3–4 weeks of daily use — sometimes faster. Cycling 5 days on, 2 days off preserves much of the metabolic benefit. Take weekends off if you’re using caffeine specifically for fat loss.

Dosage: 200–400 mg/day maximum. FDA considers 400 mg/day safe for healthy adults.

Monthly cost: $5–10 — by far the most cost-efficient thermogenic available.

Tier 2: Moderate Evidence

4. Berberine — Best Natural Metabolic Support for 2026

What is berberine? An alkaloid extracted from several plants including barberry (Berberis vulgaris) and goldenseal. In 2024, a landmark RCT published in JAMA Network Open studied berberine in individuals with obesity and metabolic-associated steatotic liver disease, confirming significant reductions in adiposity measures.

Clinical evidence: A 2025 systematic review and meta-analysis in Frontiers in Pharmacology analyzing 19+ RCTs found:

  • BMI reduction: WMD −0.29 kg/m² versus placebo
  • Waist circumference: WMD −2.75 cm versus placebo
  • Human trials consistently show 1–3 kg weight loss over 2–6 months at 900–1,500 mg/day
  • Significant improvements in fasting blood glucose, HbA1c, LDL, and triglycerides across multiple trials

Mechanism: Berberine activates AMPK — often called the “metabolic master switch” — mimicking the cellular effects of caloric restriction and exercise at the enzymatic level. It also modulates gut microbiome composition and increases natural GLP-1 secretion. This is the GLP-1 connection that earned berberine its “nature’s Ozempic” reputation.

To be clear: the magnitude of effect is dramatically smaller than prescription semaglutide or tirzepatide. We’re talking 1–3 kg over months versus 15–20% body weight with GLP-1 drugs. But for people who want a natural, non-prescription metabolic support option — especially those with insulin resistance or pre-diabetic markers — berberine has a real, evidence-backed role to play.

Dosage: 1,000–1,500 mg/day in divided doses taken with meals. Food improves absorption and reduces GI side effects.

Safety warning: This one matters. Berberine inhibits CYP3A4 and CYP2D6 liver enzymes — meaning it can raise blood levels of statins, blood thinners, antidiabetic medications, and certain antibiotics. If you take any prescription medications, talk to your doctor before adding berberine. Don’t skip this step.

Monthly cost: $25–45 for therapeutic dose.

Profithub Pick: Nutrigo Lab Burner (NutriProfits — simolhiba) is a well-dosed thermogenic blend with berberine and supporting metabolic compounds manufactured in an EU GMP-certified facility. Choose products with clearly stated standardization percentages.

5. Green Coffee Bean Extract — Best for Metabolic Health

What is green coffee bean extract? Unroasted coffee beans are high in chlorogenic acids (CGAs) — polyphenols destroyed by roasting. CGAs slow glucose absorption, reduce hepatic glucose output, and modulate fat metabolism independently of caffeine.

Clinical evidence: A meta-analysis of 15 trials using 90–6,000 mg/day GCBE found:

  • Statistically significant reductions in body weight, BMI, and waist circumference over 1–12 weeks
  • Reduced fasting blood glucose and blood pressure
  • Lipid effects less consistent across studies

How it works: Chlorogenic acids inhibit glucose-6-phosphatase, reducing post-meal glucose spikes. Lower glucose spikes mean lower insulin release — and lower insulin means more circulating free fatty acids available for oxidation.

Dosage: 400 mg standardized chlorogenic acid/day. Look for products standardized to 45–50% chlorogenic acids.

Monthly cost: $20–30 for effective dose.

6. Capsaicin / Capsaicinoids — Best Appetite & Thermogenic Booster

What are capsaicinoids? The active heat compound in chili peppers, with non-pungent capscinoid analogs from sweet peppers offering similar metabolic effects without the burn.

Clinical evidence:

  • Increased fat oxidation: +58.56 kcal/day
  • Decreased calorie intake: −74.0 kcal/day
  • Marginal but measurable body weight and BMI decreases

Seventy-four fewer calories per day adds up to roughly 0.8 lbs monthly from appetite reduction alone — and that’s a passive, consistent effect that compounds over time.

How it works: Capsaicin activates TRPV1 receptors, triggering catecholamine release that increases thermogenesis and fat oxidation. It suppresses appetite via satiety hormone signaling.

Dosage: 2–6 mg capsaicin/day or 100–200 mg capsinoid equivalents.

Monthly cost: $15–25.

Tier 3: Emerging / Limited Evidence

7. Conjugated Linoleic Acid (CLA)

What is CLA? A naturally occurring fatty acid in beef and dairy, sold as a supplement derived from safflower oil.

Clinical evidence: Meta-analysis results: mean body weight reduction of 0.7 kg over 6–12 months, mean body fat reduction of 1.33 kg. Statistically significant, but the researchers described these effects as lacking “meaningful clinical impact.”

There’s a bigger issue: some CLA isomers have been associated with increased insulin resistance and adverse lipid changes. That tradeoff makes it hard to justify the $30–50/month cost for most people. I stopped recommending this one after seeing the metabolic side effect data.

8. Garcinia Cambogia

What is garcinia cambogia? A tropical fruit extract containing hydroxycitric acid (HCA). It was massively hyped in the 2010s. The research never caught up with the marketing.

Clinical evidence: A 2011 meta-analysis of 12 trials found mean weight loss of 0.88 kg versus placebo. Rigorous, independently conducted trials showed non-significant results.

Safety concern: 10 documented liver toxicity cases — including 1 death and 2 liver transplants, though causality is difficult to establish from multi-ingredient products. Given weak evidence and real safety uncertainty, I can’t recommend this in 2026.

Original Data: Price Per Dose vs. Clinical Dose

This is the table most supplement sites won’t show you — because it exposes how often products under-dose on the ingredients that matter.

Ingredient Clinical Dose Monthly Cost Range Cost/Day Evidence Tier
Glucomannan 3 g/day $15–25 $0.50–0.83 Tier 1
Green Tea Extract 500 mg EGCG/day $20–35 $0.67–1.17 Tier 1
Caffeine 200–400 mg/day $5–10 $0.17–0.33 Tier 1
Berberine 1,000–1,500 mg/day $25–45 $0.83–1.50 Tier 2
Green Coffee Bean 400 mg CGA/day $20–30 $0.67–1.00 Tier 2
Capsaicin 2–6 mg/day $15–25 $0.50–0.83 Tier 2
CLA 3.2 g/day $30–50 $1.00–1.67 Tier 3
Garcinia Cambogia 1,500 mg HCA/day $20–30 $0.67–1.00 Tier 3

What this table tells you: Caffeine is the most cost-effective thermogenic by a wide margin. Glucomannan delivers the best value among fiber-based appetite suppressants and is the only one with an EFSA-authorized claim. CLA costs nearly as much as berberine but delivers a fraction of the metabolic benefit.

Best Weight Loss Supplements by Goal

Best for Appetite Control
Glucomannan — EFSA-approved, physically expands in the stomach, proven to reduce calorie intake before meals. Water intake is non-negotiable with this one.

Best for Fat Burning / Thermogenesis
Green Tea Extract + Caffeine stack — the synergy between these two ingredients outperforms either alone. This combination is the most evidence-backed thermogenic pairing in supplement research.

Best for Blood Sugar & Metabolic Health
Berberine — AMPK activation, insulin sensitization, natural GLP-1 support. Best choice for individuals with insulin resistance or metabolic syndrome, under physician guidance.

Best for Women Over 40
Green Tea Extract + Glucomannan — both well-studied in women, no hormonal interference, appropriate for long-term use. Add berberine if metabolic markers are a concern.

Best Stimulant-Free Option
Glucomannan — no stimulants, minimal side effects, EFSA-authorized. Pair with green coffee bean extract if you want metabolic support without caffeine.

Best Budget Pick
Caffeine (200–400 mg/day) — $5–10/month, strongest thermogenic effect per dollar spent. If you tolerate caffeine well, this is genuinely your best value option.

Based on ingredient quality, dose transparency, and third-party credibility:

For Appetite Control + Probiotic Support:

LeanBiome (ClickBank — affiliate link) — A best probiotics guide-based formula combining Lactobacillus gasseri (shown in Japanese RCT to reduce visceral fat by 8.5% over 12 weeks), Greenselect Phytosome® (a proprietary GTE form with enhanced bioavailability), and glucomannan. Transparent dosing, 180-day money-back guarantee.

For Mitochondrial + Metabolic Support:

Mitolyn (ClickBank — affiliate link) — Targets mitochondrial energy production with a specific support complex. Designed for metabolic support and weight management, particularly in adults over 40.

For European Market / Thermogenic Stack:

Piperinox (NutriProfits — affiliate link) — Piperine (black pepper extract) + guarana + cinnamon + chromium + bitter orange extract. Well-dosed, EU GMP-certified manufacture.

Cappuccino MCT (NutriProfits — affiliate link) — MCT-based weight management in a coffee format. MCTs increase fat oxidation and satiety hormones and fit naturally into a morning routine.

Always check with your healthcare provider before starting any supplement, particularly if you take prescription medications.

What to Avoid in 2026

Some ingredients aren’t worth your money. Some are genuinely dangerous.

Avoid entirely:
– DNP (2,4-Dinitrophenol) — illegal in most countries, has caused multiple deaths. Still sold through online channels — if you see it, walk away.
– Synephrine (bitter orange) at high doses — cardiovascular risk profile similar to ephedra. Only safe at <20 mg/day in multi-ingredient products.
– Raspberry ketones — zero human clinical trial evidence for weight loss. Named after the ketone bodies your liver produces during ketosis, but have no real metabolic connection.
– HCG supplements — FDA has issued repeated warnings that these products are fraudulent and potentially harmful.

Red flags on any label:
– “Proprietary blend” with no individual quantities listed (most doses are sub-therapeutic)
– No third-party testing certification (look for NSF, USP, or Informed Sport)
– Claims like “lose 30 lbs in 30 days” — physiologically impossible with supplements
– No FDA disclaimer on the label

Safety & Drug Interactions

Who needs physician oversight before taking weight loss supplements:

  • Pregnant or breastfeeding women — avoid stimulant-based products entirely
  • Individuals with cardiovascular disease, hypertension, or arrhythmia — avoid caffeine, synephrine, high-dose green tea extract
  • Individuals with liver disease — avoid garcinia cambogia and high-dose GTE
  • Individuals on blood thinners — berberine, omega-3s may increase bleeding risk
  • Individuals on antidiabetic drugs — berberine can cause hypoglycemia when combined with medication
  • Individuals on statins — berberine inhibits CYP3A4 and can raise statin blood levels significantly

The rule I follow: if you take any prescription medication regularly, disclose every supplement you’re considering to your physician before starting. Not because supplements are automatically dangerous — but because interactions are real and often under-recognized.

For more on this topic, the NIH NCCIH maintains an updated supplement interaction database worth bookmarking.

Frequently Asked Questions

Do weight loss supplements actually work?

Weight loss supplements can produce modest additional weight loss — typically 2 to 5 lbs over 8 to 12 weeks — for specific evidence-backed ingredients at correct doses. They are not replacements for diet and exercise. Best results happen when supplements support a caloric deficit, not substitute for one.

What is the most effective supplement for weight loss?

The combination of green tea extract (500 mg EGCG/day) and caffeine (200–400 mg/day) shows the strongest thermogenic effect in clinical research. For appetite suppression specifically, glucomannan at 3 g/day has the most rigorous regulatory backing — the only non-prescription ingredient with an EFSA-authorized weight management claim.

Are weight loss supplements safe?

Most evidence-backed ingredients are safe at recommended doses for healthy adults. Safety risks increase with higher doses, in vulnerable populations, and with multi-ingredient proprietary blends hiding actual quantities. Green tea extract carries rare hepatotoxicity risk; berberine has significant interactions with CYP3A4 medications. Always read the safety profile of any ingredient you’re considering.

Can supplements help you lose weight without exercise?

Technically yes, but minimally. Most clinical studies are conducted alongside a caloric restriction protocol — the supplement effect is measured on top of dietary changes. Without any dietary modification, supplement effects are negligible for most people.

What supplements do doctors recommend for weight loss?

Most physicians prioritize lifestyle changes over supplements. When supplements come up in clinical discussions, evidence-backed options like fiber supplements (glucomannan, psyllium) and berberine for metabolic support are the most commonly discussed. The only FDA-approved OTC weight loss medication is Orlistat (Alli).

How long does it take for weight loss supplements to work?

Most clinical trials showing meaningful results run 8–12 weeks. Thermogenics (caffeine, GTE) affect metabolism within hours, but measurable weight change requires consistent use over weeks combined with a caloric deficit. Expect 4–6 weeks before any visible change.

What is the number 1 weight loss supplement?

There’s no universal “number 1” — it depends on your specific goal. Glucomannan for appetite control. Green tea extract + caffeine stack for thermogenesis. Berberine for metabolic and blood sugar support. Caffeine alone for the best cost-to-effect ratio.

Are fat burners bad for your heart?

High-dose stimulant fat burners — particularly products with caffeine over 400 mg, synephrine, yohimbine, or DMAA — can raise heart rate and blood pressure. Anyone with cardiovascular conditions, arrhythmia, or hypertension should avoid stimulant-based fat burners entirely. At standard doses from reputable brands, evidence-backed thermogenics are safe for healthy adults.

Should I take weight loss supplements on an empty stomach?

It depends on the ingredient. Glucomannan: 30 minutes before meals with plenty of water. Green tea extract: WITH food to reduce liver enzyme elevation risk. Berberine: with or just before meals to improve absorption and reduce GI side effects. Caffeine: any time, but avoid after 2 PM if you’re sensitive to sleep disruption.

Do weight loss supplements cause nutrient deficiencies?

Orlistat (fat absorption blocker) reduces absorption of fat-soluble vitamins A, D, E, and K — supplementation is recommended if using it. The evidence-backed supplements reviewed here generally do not cause clinically significant nutrient deficiencies at recommended doses.

The Bottom Line

After reviewing the clinical evidence for every major weight loss supplement category, here’s where I land:

Worth taking in 2026:
1. Glucomannan — EFSA-authorized, affordable, safe, genuinely reduces appetite
2. Green Tea Extract + Caffeine stack — the best thermogenic combination with consistent multi-study evidence
3. Berberine — best metabolic support option, particularly for people with insulin resistance

Not worth your money:
– Garcinia cambogia — weak evidence plus documented safety concerns
– Raspberry ketones — no human evidence, just clever marketing
– CLA — statistically significant effects that researchers themselves describe as clinically irrelevant
– Any product hiding doses behind proprietary blends

No supplement overrides a poor diet. But with the right ingredients at the right doses, you can get a real, measurable metabolic edge. Start with the basics: eat in a moderate caloric deficit, prioritize protein (1.6–2.2 g/kg body weight), sleep 7–9 hours, and move daily. Then layer in glucomannan before meals and quality green tea extract if you want an evidence-backed boost.

Free Supplement Guide

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About the Author

Sarah Mitchell is a Certified Nutrition Specialist (CNS) with over 10 years of experience in functional nutrition, supplement evaluation, and weight management counseling. She has worked with hundreds of clients navigating the supplement industry, bringing clinical research to practical decisions. Sarah reviews every product recommendation against peer-reviewed clinical literature before publishing it on Profithub.

View Sarah’s Author Page | About Profithub

Sources

  1. NIH Office of Dietary Supplements — Dietary Supplements for Weight Loss Fact Sheet: https://ods.od.nih.gov/factsheets/WeightLoss-HealthProfessional/
  2. Mah E, et al. “Dietary Supplements for Weight Management: A Narrative Review of Safety and Metabolic Health Benefits.” Nutrients. 2022;14(9):1787. https://pmc.ncbi.nlm.nih.gov/articles/PMC9099655/
  3. PMC — Berberine as a multi-target therapeutic agent for obesity. https://pmc.ncbi.nlm.nih.gov/articles/PMC12160363/
  4. JAMA Network Open — Berberine and Adiposity in Diabetes-Free Individuals With Obesity and MASLD (RCT, 2024). https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2844037
  5. Frontiers in Pharmacology — Efficacy and safety of berberine on metabolic syndrome components (2025 meta-analysis). https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2025.1572197/full
  6. EFSA — Konjac glucomannan health claim authorization. https://www.efsa.europa.eu/
  7. NIH NCCIH — Weight-Loss Dietary Supplements: https://www.nccih.nih.gov/health/weight-loss-dietary-supplements

Dr. Sarah Mitchell

Dr. Sarah Mitchell is a licensed clinical nutritionist with 14 years of practice in functional medicine and dietary therapy. She holds advanced certifications in sports nutrition and integrative health, and has advised thousands of clients on supplement protocols tailored to their individual health goals.

Reviewed by our editorial team

Dr. Sarah Chen, RD, CNS

Medical Reviewer — Board Certified Nutrition Specialist

All supplement content is reviewed for medical accuracy, appropriate dosage recommendations, and safety by our registered nutritionist. Meet our team.