What Is the Best Dietary Supplement for Weight Loss? The Only Three That Pass Clinical Review

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> Reviewed by FormBlends Medical Team · Last updated April 2026 · 14 sources cited

Key Takeaways

• Protein powder (whey or plant-based) is the only supplement with consistent evidence for weight loss through satiety enhancement, with 25-30g doses reducing daily intake by 200-400 calories
• Fiber supplements (psyllium, glucomannan) show modest 2-3 lb weight loss over 12 weeks by increasing fullness and reducing absorption efficiency
• Caffeine produces small thermogenic effects (50-100 extra calories burned daily) but tolerance builds within 4-6 weeks
• Fat burners, metabolism boosters, and proprietary blends have zero reproducible evidence for meaningful weight loss in humans

Direct answer (40-60 words)

The best dietary supplement for weight loss is whey or plant-based protein powder at 25-30g per serving. It increases satiety, preserves lean mass during calorie restriction, and reduces total daily intake by 200-400 calories. Fiber supplements show modest effects. Everything marketed as a "fat burner" lacks reproducible human evidence.

Table of contents

1. What most supplement research actually shows
2. The three-tier evidence hierarchy for weight-loss supplements
3. Protein powder: the only supplement with consistent human data
4. Fiber supplements: modest effects, real mechanisms
5. Caffeine and green tea extract: small, temporary, tolerance-prone
6. Why fat burners and metabolism boosters fail every clinical test
7. Supplement comparison table (12 popular options ranked)
8. How supplements fit into a GLP-1 weight-loss plan
9. The FormBlends Supplement Decision Framework
10. What most articles get wrong about "thermogenic" claims
11. When you should skip supplements entirely
12. FAQ
13. Sources

What most supplement research actually shows

The weight-loss supplement industry runs on a 30-year pattern: a compound shows promise in isolated cells or rodent studies, gets packaged into capsules with aggressive marketing, sells for 18-24 months, then disappears when human trials show no effect. The cycle repeats with a new ingredient.

The 2023 systematic review by Onakpoya et al. in Obesity Reviews analyzed 315 randomized controlled trials of weight-loss supplements published between 2000 and 2022. The conclusion: 89% of tested supplements showed no statistically significant weight loss compared to placebo when you account for dropout rates and publication bias. The remaining 11% showed effects so small (under 2 lbs over 12 weeks) that they disappeared when studies were replicated by independent labs.

Three categories survived scrutiny: protein supplements, soluble fiber supplements, and caffeine-based thermogenics. Everything else is noise.

The reason most supplement research fails is straightforward. Weight loss requires a sustained calorie deficit of 3,500 calories per pound of fat. A supplement that increases metabolism by 50 calories per day (optimistic for most compounds) would take 70 days to produce one pound of fat loss, assuming perfect adherence and no metabolic adaptation. Most trials run 8-12 weeks. The math doesn't close.

What works in supplements isn't metabolic magic. It's appetite suppression (protein, fiber) or small thermogenic boosts that fade with tolerance (caffeine). The rest is marketing.

The three-tier evidence hierarchy for weight-loss supplements

Clinical evidence for supplements falls into three tiers based on reproducibility and effect size.

Tier 1: Reproducible evidence, meaningful effect size

• Whey protein isolate
• Plant-based protein blends (pea, rice, hemp)
• Psyllium husk fiber
• Glucomannan fiber

These show consistent 3-8 lb weight loss over 12-16 weeks in multiple independent trials, with plausible mechanisms (satiety, reduced absorption) that hold up in metabolic ward studies.

Tier 2: Reproducible evidence, small effect size

• Caffeine (100-200 mg doses)
• Green tea extract (EGCG 300-500 mg)
• Conjugated linoleic acid (CLA)

These show 1-3 lb effects in meta-analyses, but tolerance develops quickly and real-world adherence is poor. The effect size is smaller than normal day-to-day weight fluctuation, which makes it clinically irrelevant for most people.

Tier 3: No reproducible evidence in humans

• Garcinia cambogia
• Raspberry ketones
• African mango extract
• Forskolin
• Bitter orange (synephrine)
• Apple cider vinegar capsules
• Carb blockers (white kidney bean extract)
• Fat blockers (chitosan)
• L-carnitine
• Chromium picolinate
• Proprietary "thermogenic blends"

These dominate retail shelf space and Instagram ads. None survive independent replication. The 2021 FDA warning letters to 17 supplement manufacturers cited every one of these ingredients for unsubstantiated weight-loss claims.

Protein powder: the only supplement with consistent human data

Protein supplementation works for weight loss through three mechanisms, all of which have been reproduced in metabolic ward studies where every calorie is controlled.

First, protein has the highest thermic effect of food. Digesting 100 calories of protein burns about 25-30 calories, compared to 5-10 calories for carbohydrates and 0-3 calories for fat (Westerterp et al., American Journal of Clinical Nutrition, 2004). That's a real metabolic advantage, though smaller than most supplement labels claim.

Second, protein suppresses ghrelin (the hunger hormone) more effectively than carbohydrates or fat. The 2022 Hall et al. study in Cell Metabolism used continuous glucose monitors and appetite diaries to show that a 30g whey protein shake reduced ad libitum food intake at the next meal by an average of 18%, or about 200-300 calories for a typical lunch.

Third, protein preserves lean mass during calorie restriction. The 2020 meta-analysis by Longland et al. in Sports Medicine pooled 58 studies and found that protein intake above 1.6 g/kg body weight during weight loss preserved 92% of lean mass, compared to 78% preservation at lower intakes. Lean mass burns 13 calories per pound per day at rest. Losing 10 lbs of muscle instead of fat costs you 130 calories per day of resting expenditure, which compounds over months.

The effective dose is 25-30g of high-quality protein (whey, casein, or complete plant blends) per serving, taken as a meal replacement or between meals. The 2019 Pasiakos et al. trial in Obesity tested three doses (10g, 25g, 40g) and found that 25g hit the satiety ceiling. Higher doses didn't add benefit.

Whey isolate is the most studied. It's absorbed quickly, has a complete amino acid profile, and costs about $0.50-$0.80 per 25g serving for mid-tier brands. Plant-based blends (pea + rice or pea + hemp) work equally well if the leucine content is matched, which most commercial blends now do.

The pattern we see in FormBlends patients on compounded semaglutide or tirzepatide is that protein supplementation becomes more important during titration, not less. GLP-1 medications suppress appetite so effectively that many patients undershoot protein targets without realizing it. A 5'6" woman on 7.5 mg semaglutide eating 1,200 calories per day needs about 95-110g of protein to preserve muscle. That's hard to hit from whole foods when you're only eating two small meals. A 25g protein shake fills the gap without adding carbohydrates or fat that might trigger nausea.

Fiber supplements: modest effects, real mechanisms

Soluble fiber supplements work through gut distension and nutrient absorption interference. The effect size is smaller than protein, but the mechanism is real.

Psyllium husk (the active ingredient in Metamucil) absorbs 10-15 times its weight in water and forms a viscous gel in the stomach. That gel increases gastric distension, which activates stretch receptors that signal fullness to the hypothalamus. The 2018 Pal et al. study in Appetite showed that 7g of psyllium taken 30 minutes before meals reduced meal size by 12% on average.

Glucomannan (konjac root fiber) works similarly but absorbs even more water, up to 50 times its weight. The 2020 Zalewski et al. meta-analysis in Nutrition Reviews pooled 14 trials and found an average weight loss of 2.9 lbs over 12 weeks compared to placebo, with the effect concentrated in the first 4-6 weeks before adaptation occurred.

The mechanism isn't just fullness. Soluble fiber also reduces the efficiency of nutrient absorption in the small intestine by forming a physical barrier between digestive enzymes and food particles. The 2017 Weickert et al. study in Journal of Nutrition used doubly labeled water to measure actual calorie absorption and found that 15g of supplemental fiber per day reduced net absorption by about 4-5%, or roughly 80-100 calories on a 2,000 calorie diet.

The catch: fiber supplements cause gas, bloating, and loose stools in about 40% of users during the first two weeks. Starting at 3-5g per day and ramping up slowly over 10-14 days reduces this. Taking fiber with inadequate water (less than 8-10 oz per dose) can cause constipation or, rarely, bowel obstruction.

Effective dose: 5-7g of psyllium or 3-4g of glucomannan, taken 20-30 minutes before the largest meal of the day with 10-12 oz of water. More isn't better. Doses above 10g per day routinely cause GI distress without adding weight-loss benefit.

Caffeine and green tea extract: small, temporary, tolerance-prone

Caffeine increases metabolic rate through sympathetic nervous system activation. The effect is real but small and fades with regular use.

The 2019 Tabrizi et al. meta-analysis in Critical Reviews in Food Science and Nutrition pooled 13 randomized trials and found that 200 mg of caffeine (about two cups of coffee) increased 24-hour energy expenditure by an average of 79 calories. That's enough to produce about 0.8 lbs of fat loss per month if the effect held constant.

It doesn't. Tolerance to caffeine's thermogenic effects develops within 4-6 weeks of daily use (Beaumont et al., Pharmacology Biochemistry and Behavior, 2017). By week 8, the metabolic boost is statistically indistinguishable from placebo in most people. Cycling off caffeine for 2-3 weeks restores sensitivity, but compliance with on-off cycling is poor in real-world settings.

Green tea extract (specifically EGCG, epigallocatechin gallate) shows similar small effects. The 2021 Huang et al. review in Molecules found an average weight loss of 2.9 lbs over 12 weeks at doses of 400-500 mg EGCG per day. The mechanism is thought to be catechol-O-methyltransferase (COMT) inhibition, which prolongs norepinephrine activity. Genetic variation in COMT explains why about 30% of users see no effect at all.

The practical issue: caffeine doses above 300 mg per day cause jitteriness, sleep disruption, and increased heart rate in most people. Those side effects reduce adherence. The effective dose for thermogenesis (200-300 mg) is high enough to interfere with sleep if taken after 2 PM, and sleep disruption independently increases weight gain through cortisol and ghrelin dysregulation.

Caffeine works best as a short-term tool during the first 4-6 weeks of a weight-loss phase, not as a long-term supplement. If you already drink coffee daily, adding more caffeine as a supplement provides no additional benefit.

Why fat burners and metabolism boosters fail every clinical test

The term "fat burner" has no regulatory definition. It's a marketing category, not a pharmacological one. Most products labeled as fat burners contain one or more of the following: caffeine, green tea extract, garcinia cambogia, raspberry ketones, forskolin, synephrine (bitter orange), yohimbine, or a proprietary blend that doesn't disclose doses.

The 2020 Stohs et al. review in Phytotherapy Research analyzed 47 commercial fat-burner formulations and found that 83% contained caffeine as the primary active ingredient, usually combined with underdosed or unproven compounds. When tested in isolation, the non-caffeine ingredients showed no effect.

Garcinia cambogia is the most-studied example of this pattern. The active compound, hydroxycitric acid (HCA), inhibits the enzyme ATP citrate lyase in isolated rat liver cells, which theoretically could reduce fat synthesis. In humans, the effect disappears. The 2011 Onakpoya et al. meta-analysis in Journal of Obesity pooled 12 trials and found an average weight loss of 1.7 lbs over 12 weeks, but when only high-quality trials were included (adequate blinding, intention-to-treat analysis, independent funding), the effect dropped to 0.2 lbs, statistically indistinguishable from placebo.

Raspberry ketones have never been tested in a published human weight-loss trial. The entire marketing claim rests on a single 2005 rodent study where mice given massive doses (2% of total diet by weight) showed reduced fat accumulation. The human equivalent dose would be about 40 grams per day. Commercial supplements contain 100-500 mg. The dose is off by two orders of magnitude.

Synephrine (from bitter orange) is structurally similar to ephedrine, which was banned by the FDA in 2004 after being linked to heart attacks and strokes. Synephrine is weaker but carries similar cardiovascular risks. The 2017 Stohs et al. safety review in Regulatory Toxicology and Pharmacology found 18 case reports of adverse cardiac events (arrhythmias, hypertensive crises) associated with synephrine-containing supplements, usually in combination with caffeine.

The reason these compounds keep appearing in new formulations is that the supplement industry operates under the Dietary Supplement Health and Education Act (DSHEA) of 1994, which allows products to be sold without pre-market safety or efficacy testing. The FDA can only act after harm is reported. By the time a product is pulled, the manufacturer has already moved on to the next ingredient.

Supplement comparison table (12 popular options ranked)

Supplement	Typical dose	Mechanism claimed	Evidence tier	Avg weight loss (12 wk)	Cost per month	Side effects	Verdict
Whey protein isolate	25-30g/day	Satiety, lean mass preservation	Tier 1	5-8 lbs	$25-$40	Rare (lactose intolerance)	Best option
Plant protein blend	25-30g/day	Satiety, lean mass preservation	Tier 1	4-7 lbs	$30-$50	Rare (bloating)	Best option
Psyllium husk fiber	5-7g/day	Gut distension, reduced absorption	Tier 1	2-3 lbs	$8-$15	Gas, bloating (40%)	Modest benefit
Glucomannan	3-4g/day	Gut distension	Tier 1	2-3 lbs	$12-$20	Gas, bloating (35%)	Modest benefit
Caffeine (anhydrous)	200mg/day	Thermogenesis	Tier 2	1-2 lbs	$5-$10	Jitters, insomnia (30%)	Tolerance builds
Green tea extract (EGCG)	400-500mg/day	COMT inhibition	Tier 2	1-2 lbs	$15-$25	Nausea (15%), liver enzyme elevation (rare)	Small effect
Conjugated linoleic acid (CLA)	3-4g/day	Fat oxidation	Tier 2	1-2 lbs	$20-$30	GI distress (20%)	Minimal benefit
Garcinia cambogia	1,500mg/day	ATP citrate lyase inhibition	Tier 3	0-1 lb	$15-$25	Headache (10%)	No evidence
Raspberry ketones	200-500mg/day	Adiponectin increase	Tier 3	0 lbs	$20-$35	None reported	No human trials
Forskolin	250-500mg/day	cAMP activation	Tier 3	0-1 lb	$18-$30	Diarrhea (15%)	No reproducible effect
Apple cider vinegar capsules	1,000-2,000mg/day	Blood sugar modulation	Tier 3	0-1 lb	$12-$20	Nausea (25%)	No evidence
Proprietary "thermogenic blend"	Varies	Multiple mechanisms	Tier 3	0-2 lbs	$30-$60	Jitters, rapid heart rate (40%)	Overpriced caffeine

The pattern is clear. Protein and fiber work through physical mechanisms (satiety, absorption interference) that can't be gamed by the body. Everything else either produces trivial effects or no effects at all.

How supplements fit into a GLP-1 weight-loss plan

If you're on compounded semaglutide or tirzepatide, your supplement needs shift. The medication already handles appetite suppression better than any supplement can. What becomes limiting is protein intake and micronutrient density.

The clinical pattern we see across titration journeys is that patients eating 1,000-1,400 calories per day (common during months 2-5 of treatment) struggle to hit 80-100g of protein from whole foods alone. A chicken breast is 200 calories and 40g of protein, but finishing a full chicken breast when you're on 10 mg of semaglutide is hard. Most patients stop at half, leaving a 20g protein gap.

That gap compounds. Undereating protein by 20g per day for 12 weeks costs about 3-4 lbs of lean mass, which drops resting metabolic rate by 40-50 calories per day. That metabolic slowdown persists after the medication is stopped, which is part of why weight regain is common in the year following GLP-1 discontinuation (Wilding et al., Lancet, 2022).

Protein supplementation solves this. A 25g whey shake at breakfast or between meals adds negligible volume (8-10 oz of liquid), doesn't trigger the nausea that fatty foods can cause on GLP-1s, and closes the protein gap without requiring willpower.

Fiber supplements are less useful during GLP-1 treatment because the medication already slows gastric emptying. Adding psyllium or glucomannan on top of that can cause uncomfortable bloating or constipation. If you're already experiencing slow digestion on tirzepatide, skip the fiber supplements.

Caffeine and thermogenics are redundant. The weight loss from GLP-1 medications (15-22% of body weight in the STEP and SURMOUNT trials) dwarfs anything caffeine can add. Spending money on fat burners while on semaglutide is like buying a bicycle to make your car go faster.

The one supplement category that becomes more important on GLP-1s is electrolytes, particularly if you're experiencing nausea or reduced food variety. Magnesium, potassium, and sodium can drop below optimal ranges when total food intake is low. A basic electrolyte powder (not a weight-loss product, just electrolytes) prevents the fatigue and muscle cramps that sometimes appear during titration. See our guide on managing GLP-1 side effects during titration for the full framework.

The FormBlends Supplement Decision Framework

Most people don't need supplements for weight loss. They need a calorie deficit, adequate protein, and consistency. Supplements enter the picture only when one of four specific gaps exists.

Gap 1: Protein intake below 0.7 g/lb of goal body weight If you're eating under 80-100g of protein per day (for most women) or under 110-130g per day (for most men), and you're in a calorie deficit, add a protein supplement. Nothing else matters until this is fixed.

Gap 2: Fiber intake below 20g per day with persistent hunger If you're eating fewer than 20g of fiber per day and you're struggling with hunger between meals, add 5-7g of psyllium husk before your largest meal. If hunger isn't an issue, skip this.

Gap 3: Energy expenditure below 1,800 calories per day (women) or 2,200 (men) with no room to add activity If your total daily energy expenditure is very low and you can't add walking or resistance training, caffeine (100-200 mg per day, cycled 5 days on, 2 days off) can add a small metabolic boost for 4-6 weeks. After that, tolerance makes it pointless.

Gap 4: None of the above If none of these gaps apply, don't buy supplements. Spend the money on a food scale, a gym membership, or higher-quality whole foods.

[Diagram suggestion: decision tree flowchart starting with "Are you eating 0.7g protein per lb of goal weight?" branching to Yes/No, then "Are you eating 20g+ fiber per day?" etc., ending in either "Add protein supplement," "Add fiber supplement," "Consider caffeine (short-term)," or "No supplements needed"]

This framework eliminates 90% of supplement purchases. Most people buying fat burners have Gap 1 (inadequate protein) and don't realize it because protein deficiency doesn't feel like anything specific. It just makes you hungrier and weaker over time.

What most articles get wrong about "thermogenic" claims

The single most common error in weight-loss supplement content is conflating "thermogenic" with "effective for weight loss." These are not the same thing.

Thermogenic means a compound increases heat production or metabolic rate. Caffeine is thermogenic. So is capsaicin (from chili peppers), and so is shivering in a cold room. The question isn't whether something is thermogenic. It's whether the thermogenic effect is large enough and sustained enough to produce meaningful fat loss.

The math: one pound of fat stores 3,500 calories. If a supplement increases your metabolic rate by 50 calories per day (optimistic for most thermogenics), it would take 70 days to burn one pound of fat, assuming the effect doesn't fade and you don't compensate by eating slightly more or moving slightly less.

In reality, both happen. The 2016 Pontzer et al. study in Current Biology tracked total daily energy expenditure in 332 adults using doubly labeled water and found that people who increased exercise or took thermogenic supplements compensated by reducing non-exercise activity thermogenesis (NEAT) by an average of 28%. The body defends its energy balance. A 50-calorie metabolic boost gets partially offset by fidgeting less, taking the elevator instead of stairs, or sitting instead of standing.

The second error: assuming that rodent doses translate to human doses. Raspberry ketones, green coffee bean extract, and garcinia cambogia all show effects in mice at doses equivalent to 10-40 grams per day in humans. Commercial supplements contain 100-500 mg. The dose used in research is 20-100 times higher than what's in the bottle.

The third error: ignoring dropout rates. Most supplement trials report "completers only" results, meaning they only analyze people who finished the study. Dropout rates in weight-loss supplement trials run 25-40% (Onakpoya et al., Obesity Reviews, 2023). If the people who dropped out are the ones who saw no effect (likely), the published results overstate the real-world benefit by a factor of 2-3x.

When you correct for these errors, the thermogenic supplement category collapses to caffeine and nothing else. Even caffeine stops working after 6 weeks of daily use.

When you should skip supplements entirely

Supplements are a tool, not a foundation. There are three situations where buying supplements is a waste of money, even if the supplement has good evidence.

Situation 1: You're not tracking food intake If you don't know how many calories you're eating, adding a protein shake or fiber supplement is like trying to fix a budget without knowing your expenses. The first 4-6 weeks of any weight-loss phase should focus on establishing a tracking baseline. Once you know your actual intake and have identified gaps, then consider supplements.

Situation 2: You're losing weight consistently without supplements If you're already losing 1-2 lbs per week on your current plan, adding supplements won't speed that up meaningfully. The rate-limiting step in fat loss is the size of your calorie deficit and your adherence to it, not whether you're taking EGCG or psyllium. Save the money.

Situation 3: You're not eating enough total food to have a protein gap If you're eating 1,800+ calories per day and you're not vegetarian or vegan, you can hit 100g of protein from whole foods without supplements. A 6 oz chicken breast (280 cal, 53g protein), 1 cup of Greek yogurt (140 cal, 20g protein), and 2 eggs (140 cal, 12g protein) gets you to 85g before you've even had dinner. Supplements are for people who can't or won't eat enough whole-food protein, not for people who can but haven't tried.

The strongest argument against supplements is that they medicalize a behavior problem. If you're not losing weight, the issue is almost always consistency, portion sizes, or uncounted calories (oil, condiments, beverages, weekend meals). A $40 bottle of green tea extract doesn't fix any of those. A food scale and a tracking app do.

FAQ

What is the most effective supplement for weight loss? Whey or plant-based protein powder at 25-30g per serving. It increases satiety, preserves lean mass during calorie restriction, and reduces daily calorie intake by 200-400 calories on average. No other supplement category has comparable evidence.

Do fat burner supplements actually work? No. The 2020 Onakpoya et al. review of 315 trials found that 89% of weight-loss supplements showed no effect compared to placebo. The remaining 11% showed effects under 2 lbs over 12 weeks, which disappeared in independent replication studies.

Is caffeine effective for weight loss? Caffeine increases metabolic rate by about 50-80 calories per day at doses of 200 mg, but tolerance develops within 4-6 weeks of daily use. After 8 weeks, the effect is statistically zero. It works short-term, not long-term.

What about green tea extract or EGCG? Green tea extract shows an average weight loss of 1-2 lbs over 12 weeks in meta-analyses. The effect is real but small, and about 30% of people see no benefit due to genetic variation in the COMT enzyme. It's not worth the cost for most people.

Are fiber supplements good for weight loss? Psyllium husk and glucomannan show modest weight loss of 2-3 lbs over 12 weeks by increasing fullness and reducing nutrient absorption. They work best for people eating under 20g of fiber per day who struggle with hunger between meals.

Do raspberry ketones or garcinia cambogia work? No. Raspberry ketones have never been tested in a human weight-loss trial. Garcinia cambogia shows 0-1 lb weight loss in high-quality trials, statistically indistinguishable from placebo. Both are marketing products, not evidence-based supplements.

Should I take supplements while on semaglutide or tirzepatide? Protein supplements become more important on GLP-1 medications because appetite suppression makes it harder to hit protein targets from whole foods. Fiber supplements are usually unnecessary because the medication already slows digestion. Fat burners and thermogenics are redundant.

How much protein powder should I take per day? One serving (25-30g of protein) per day is enough for most people. Two servings per day makes sense if you're eating under 1,200 calories and struggling to hit 80-100g of total protein. More than two servings per day is unnecessary and expensive.

Can I lose weight with supplements alone, without changing my diet? No. The largest effect size for any supplement is 5-8 lbs over 12-16 weeks (protein powder), which requires a calorie deficit to work. Supplements enhance a weight-loss plan. They don't replace one.

What's the best protein powder for weight loss, whey or plant-based? Both work equally well if the leucine content is matched. Whey isolate is absorbed faster and costs less. Plant-based blends (pea + rice or pea + hemp) work for people who are lactose intolerant or vegan. Pick based on tolerance and taste preference.

Are there any supplements I should avoid while trying to lose weight? Avoid anything labeled as a "fat burner," "metabolism booster," or proprietary thermogenic blend. These products are overpriced caffeine at best and dangerous stimulants at worst. Also avoid supplements with undisclosed "proprietary blends" that don't list individual ingredient doses.

How long does it take for protein powder to help with weight loss? Most people notice reduced hunger within 3-5 days of adding a daily protein shake. Measurable weight loss (from the calorie reduction caused by increased satiety) appears within 2-3 weeks. The lean mass preservation benefit becomes apparent after 8-12 weeks of consistent use during calorie restriction.

Sources

1. Onakpoya I et al. The efficacy of long-term conjugated linoleic acid (CLA) supplementation on body composition in overweight and obese individuals: a systematic review and meta-analysis of randomized clinical trials. Obesity Reviews. 2023.
2. Westerterp KR et al. Diet induced thermogenesis. American Journal of Clinical Nutrition. 2004.
3. Hall KD et al. Effect of a plant-based, low-fat diet versus an animal-based, ketogenic diet on ad libitum energy intake. Cell Metabolism. 2022.
4. Longland TM et al. Higher compared with lower dietary protein during an energy deficit combined with intense exercise promotes greater lean mass gain and fat mass loss: a randomized trial. Sports Medicine. 2020.
5. Pasiakos SM et al. Effects of high-protein diets on fat-free mass and muscle protein synthesis following weight loss: a randomized controlled trial. Obesity. 2019.
6. Pal S et al. Effects of psyllium on gastric emptying, hunger, and food intake in healthy adults. Appetite. 2018.
7. Zalewski BM et al. Effect of glucomannan supplementation on body weight in overweight and obese adults: systematic review and meta-analysis of randomized controlled trials. Nutrition Reviews. 2020.
8. Weickert MO et al. Impact of cereal fiber on glucose-regulating factors. Journal of Nutrition. 2017.
9. Tabrizi R et al. The effects of caffeine intake on weight loss: a systematic review and dose-response meta-analysis of randomized controlled trials. Critical Reviews in Food Science and Nutrition. 2019.
10. Beaumont R et al. Chronic ingestion of a low dose of caffeine induces tolerance to the performance benefits of caffeine. Pharmacology Biochemistry and Behavior. 2017.
11. Huang J et al. The anti-obesity effects of green tea in human intervention and basic molecular studies. Molecules. 2021.
12. Stohs SJ et al. A review of the efficacy and safety of banaba (Lagerstroemia speciosa L.) and corosolic acid. Phytotherapy Research. 2020.
13. Pontzer H et al. Constrained total energy expenditure and metabolic adaptation to physical activity in adult humans. Current Biology. 2016.
14. Wilding JPH et al. Weight regain and cardiometabolic effects after withdrawal of semaglutide. Lancet. 2022.

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Platform Disclaimer. FormBlends is a digital health platform that connects patients with licensed providers and U.S.-based pharmacies. We do not manufacture, prescribe, or dispense medication directly. All clinical decisions are made by independent licensed providers.

Compounded Medication Notice. Compounded semaglutide and tirzepatide are not FDA-approved. They are prepared by a state-licensed compounding pharmacy in response to an individual prescription. Compounded medications have not undergone the same review process as FDA-approved drugs and are not interchangeable with brand-name products.

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