We ranked these by evidence, not by what we can earn on them. That means the thing at number one is a cheap fiber you can buy in any pharmacy, and the branded formula we have an affiliate relationship with sits at number four. We think that’s the only version of this list worth publishing.
Every entry below names the dose the research actually used, because in this category the dose is almost always where the marketing and the science part ways.
The short answer
No over-the-counter appetite suppressant produces meaningful weight loss on its own. What the better ones do is make a calorie deficit slightly easier to sustain — by physically slowing your stomach down, or by taking the edge off a specific craving. That is a real benefit, and it is worth roughly one to two kilograms over several months in the trials that measure it. Anything promising more than that is selling you something.
If you take one thing from this page: the mechanisms that work are boring, and they work by bulk and by physics, not by metabolism.
The ranking
Glucomannan (konjac root fiber)
Glucomannan is a soluble fiber from konjac root that absorbs many times its weight in water and forms a viscous gel in the stomach. The European Food Safety Authority assessed the evidence and permits the claim that glucomannan contributes to weight loss in the context of an energy-restricted diet — at 3 g per day, taken as three 1 g doses with water before meals. Very few supplement ingredients clear a regulatory bar like that.
The catch, and it’s a real one: glucomannan must be taken with a full glass of water. Taken dry, or in tablet form that can lodge before it hydrates, it has caused choking and oesophageal obstruction. Take capsules or powder, always with plenty of water, always well before lying down.
Psyllium husk
Psyllium is a gel-forming, poorly fermented soluble fiber — the active in most bulk laxatives. It’s been studied for satiety in controlled feeding work and for anthropometric outcomes in systematic reviews, with consistent if modest effects on weight and waist circumference alongside well-established benefits for cholesterol and bowel regularity.
It is not glamorous and nobody runs affiliate programs on it, which is precisely why it rarely appears on lists like this one. Start low, build up, and take it with water for the same reason as glucomannan.
Gymnema sylvestre — as a lozenge, mint or tea
Gymnemic acids bind to the sweet-taste receptors on the tongue and temporarily switch them off. Sugar afterwards tastes of almost nothing. A 2025 trial in adults who identified as high sweet-food consumers used a mint containing just 4 mg of extract and found a 42% reduction in sugar-sweetened beverage intake and a 28% reduction in sugar cravings versus placebo over two weeks.
Format is everything here. The effect is topical. A swallowed capsule — however many hundreds of milligrams it contains — bypasses your tongue and cannot produce it. If a product puts Gymnema in a capsule and sells it for cravings, the mechanism it’s describing isn’t the one you’re getting. Note also that the 2025 trial saw no change in body composition over 14 days; this is a tool for a specific craving, not a weight-loss agent.
Crave Burner
Crave Burner leads with 1000 mg of Carolean™, a prickly pear and carob seed blend — the same soluble-fiber principle as the two entries above it, at a smaller dose and a much higher price. It earns its place on this list for something most competitors don’t do: it publishes the exact dose of all seven actives, with no proprietary hiding.
What keeps it at four rather than higher: its Gymnema is in a capsule, so the mechanism above doesn’t apply; its Garcinia cambogia carries a rare liver-injury signal for under a kilogram of proven benefit; and its bitter orange, at about 6 mg of synephrine, has no weight-loss evidence at any dose. We also could not find a published money-back guarantee.
Chromium picolinate
A meta-analysis of ten randomized double-blind trials found chromium picolinate produced about 1.1 kg more weight loss than placebo. The authors called the clinical relevance debatable and noted the finding leaned heavily on one trial. It has also been studied specifically for carbohydrate cravings, with mixed results.
Cheap, safe, and a sensible inclusion inside a broader formula. Not a product worth buying on its own.
Garcinia cambogia / HCA
A systematic review of twelve randomized trials found a difference of roughly 0.9 kg against placebo — marginal at best. Against that, the NIH’s LiverTox database assigns Garcinia a likelihood score of B: a likely though rare cause of clinically apparent liver injury, hepatocellular in pattern, typically appearing one to four weeks after starting. Most reported cases resolved on stopping; some progressed to acute liver failure requiring transplant.
The absolute risk is low — estimated at under 1 in 10,000. But the benefit is smaller than a good week of walking, and we don’t think that trade is worth making.
Bitter orange / synephrine
A 2022 systematic review and meta-analysis found no evidence that synephrine facilitates weight loss — a non-significant 0.6 kg difference, with non-significant effects on body fat and fat mass. Prolonged use raised systolic blood pressure by about 6.4 mmHg and diastolic by 4.3 mmHg. The authors concluded it should not be used to promote health.
It appears in formulas because it reads as a stimulant on a label. At the doses that might do something, it moves your blood pressure; at the doses that don’t, it’s filler.
Side by side
| Ingredient | Evidence | Dose that was studied | Main caveat |
|---|---|---|---|
| Glucomannan | Strongest — approved EFSA claim | 3 g/day, split, with water | Choking risk if taken dry |
| Psyllium | Good, consistent, modest | 5–10 g/day | Needs water; GI adjustment period |
| Gymnema (lozenge) | Good for sweet cravings only | 4 mg extract per mint | Useless if swallowed in a capsule |
| Chromium | Weak but positive | 100–200 µg/day | ~1.1 kg; relevance debatable |
| Prickly pear / carob fiber | Plausible, inconsistent | Varies; blends rarely disclose | Small fiber dose for the price |
| Cinnamon | Small effects at gram doses | 1–3 g/day | Supplements often 10× lower |
| Garcinia / HCA | Marginal, ~0.9 kg | Varies | Rare liver injury (LiverTox B) |
| Synephrine | None for weight loss | 6–214 mg/day studied | Raises blood pressure with use |
⚠ Before you buy anything on this page
- Appetite change you didn’t choose needs a doctor, not a supplement. Unexplained weight loss, or appetite that has dropped without you trying, can signal a condition that needs diagnosing.
- Fiber supplements interact with medication timing. Viscous fiber can slow the absorption of drugs taken at the same time. Separate them by at least two hours, and ask your pharmacist if you take anything with a narrow therapeutic window.
- If you take insulin or a glucose-lowering drug, Gymnema and chromium can both affect blood sugar. That’s an interaction worth a conversation before you start.
- If you have high blood pressure or a heart rhythm condition, avoid synephrine-containing formulas.
- If you have liver disease or take a medication with liver warnings, avoid Garcinia cambogia.
- Pregnancy and breastfeeding: none of these are appropriate.
What we’d actually do
If the problem is that you feel hungry on a deficit, the cheapest effective answer is a viscous fiber before meals — glucomannan at the EFSA dose, or psyllium — plus enough protein. If the problem is specifically that you cannot stop eating sweet things in the evening, a Gymnema lozenge is a genuinely clever tool, and it costs very little to test for a fortnight.
If you’d rather buy one formula than assemble three things, Crave Burner is a reasonable option and an unusually transparent one — just buy it understanding that its fiber dose is smaller than what the fiber research uses, and that two of its seven ingredients would be better left out.
- Commission Regulation (EU) No 432/2012; EFSA NDA Panel opinion on glucomannan and weight reduction.
- The effect of psyllium consumption on anthropometric indices: a systematic review and dose-response meta-analysis. J Health Popul Nutr, 2025.
- The effect of a 14-day Gymnema sylvestre intervention to reduce sugar intake in people self-identifying with a sweet tooth. Appetite, 2025.
- Pittler M.H., Stevinson C., Ernst E. Chromium picolinate for reducing body weight: meta-analysis of randomized trials. Int J Obes Relat Metab Disord, 2003.
- Garcinia Cambogia. LiverTox, NCBI Bookshelf (NBK548087).
- Ruiz-Moreno C. et al. The Safety and Efficacy of Citrus aurantium and p-Synephrine. Nutrients, 2022;14(19):4019.
Affiliate disclosure: we earn a commission if you buy Crave Burner through our link. We do not earn anything on glucomannan, psyllium, Gymnema lozenges or chromium — the four things ranked above it. That ordering is the point.
Medical disclaimer: this content is for education only and is not medical advice. These statements have not been evaluated by the FDA, and no product mentioned is intended to diagnose, treat, cure or prevent any disease. Talk to a healthcare provider before starting any supplement, particularly if you take medication, are pregnant or breastfeeding, or manage a medical condition.