Sustainable weight loss requires a caloric deficit, but the right supplements can support your efforts. These evidence-ranked supplements work through proven mechanisms â increasing metabolic rate, reducing appetite, improving insulin sensitivity, and enhancing fat oxidation. All are backed by clinical trials and available from Australian retailers. They work best alongside a balanced diet and regular exercise.
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Research highlights
Ranked by evidence strength and effectiveness. Get personalised dosages above.
Berberine activates AMPK, the "metabolic master switch," increasing fat oxidation and reducing fat storage. Multiple RCTs show 2-3kg more weight loss vs placebo over 12 weeks. Effects are comparable to metformin in head-to-head trials. Start with 500mg once daily for the first week to minimise GI side effects (diarrhoea, cramping).
Meta-analyses show green tea extract increases 24-hour energy expenditure by 80-100 kcal/day and fat oxidation by 16-17%. A Cochrane review of 14 RCTs found mean weight loss of 1.3kg over 12 weeks vs placebo. Most effective in those with low habitual caffeine intake. Choose decaffeinated extracts if sensitive to stimulants.
EFSA-approved health claim: "Glucomannan contributes to weight loss in the context of an energy-restricted diet" (at 3g/day). Systematic reviews show 0.8-1.7kg more weight loss than placebo over 5-8 weeks. Works primarily through increased satiety and reduced caloric intake. Also lowers LDL cholesterol and improves glycaemic control. Must be taken with water â can cause oesophageal obstruction if swallowed dry.
Meta-analysis of 21 RCTs shows chromium picolinate reduces body weight by ~0.5kg and body fat by ~0.46% vs placebo. Effects are most significant in overweight/obese individuals and those with insulin resistance. Primarily reduces carbohydrate cravings. The 1000mcg dose showed the strongest results but stay within tolerable upper intake.
Meta-analysis of 18 RCTs shows CLA reduces body fat by ~0.05kg/week (about 1.3kg over 6 months) without significant change in body weight â meaning CLA shifts composition from fat to lean mass. Most effective at 3.2-6.4g/day. The t10,c12 isomer drives the fat-loss effects. Some individuals experience GI discomfort initially.
Evidence ratings based on peer-reviewed clinical research. Individual results may vary.
Our recommendations are based on peer-reviewed clinical research. We evaluate each supplement on effectiveness, evidence quality, safety profile, and value for money across Australian retailers.
Always consult a healthcare professional before starting any supplement regimen, especially if you are taking medications or have existing health conditions.
Common questions
Based on clinical trial evidence, berberine (1000-1500mg/day) has the strongest support â multiple RCTs show 2-3kg additional weight loss over 12 weeks via AMPK activation. Green tea extract (500-1000mg EGCG) increases metabolic rate by 80-100 kcal/day. Glucomannan (3g/day before meals) is the only weight loss supplement with an EFSA-approved health claim. Chromium picolinate (200-1000mcg) helps reduce carbohydrate cravings. All are available from Australian retailers like iHerb, starting from ~$0.07/serve.
Berberine is sometimes called "nature's Ozempic" because it activates AMPK (like metformin) and influences GLP-1 pathways (like semaglutide/Ozempic). However, its effects are much more modest â expect 2-3kg weight loss over 12 weeks, compared to 10-15kg with Ozempic. Berberine is better positioned as a supplement for people with mild metabolic dysfunction or pre-diabetes, not as a replacement for prescription weight loss medications. It costs around $0.30-0.50/day vs $300+/month for Ozempic.
Yes â a Cochrane review of 14 randomised controlled trials found green tea extract (with EGCG) produced average weight loss of 1.3kg over 12 weeks compared to placebo. It works by inhibiting COMT, which prolongs norepinephrine signalling and increases thermogenesis. Effects are strongest in people who don't regularly consume caffeine. Look for products standardised to 50%+ EGCG. Decaffeinated versions are available for those sensitive to stimulants.
Glucomannan is a soluble fibre from konjac root that absorbs up to 50 times its weight in water, forming a gel that promotes fullness. It is the only weight loss supplement with an approved EFSA health claim. Systematic reviews show 0.8-1.7kg additional weight loss over 5-8 weeks. Take 1g with a large glass of water 30-60 minutes before each meal. Important: always take with plenty of water to avoid oesophageal obstruction.
The supplements listed here (berberine, green tea extract, glucomannan, chromium, CLA) have been studied in clinical trials with generally good safety profiles. However, berberine can cause GI side effects and interacts with diabetes medications. Green tea extract in very high doses (>800mg EGCG) has rare links to liver injury â stick to recommended doses. Glucomannan must always be taken with water. Avoid unregulated "fat burner" products that contain undisclosed stimulants. Consult your GP if you take any medications.
Yes â berberine and green tea extract work through complementary mechanisms (AMPK activation and COMT inhibition respectively) and there are no known negative interactions. Some practitioners recommend this combination for metabolic support. Take berberine with meals and green tea extract in the morning or before exercise. Start each supplement individually before combining to identify any individual sensitivities.
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