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Sodium Alginate (Seaweed Fiber)

Evidence Level
Limited
6 Clinical Trials
5 Documented Benefits
2/5 Evidence Score

Sodium alginate is the sodium salt of alginic acid, a soluble fiber taken from brown seaweeds. A drink made with it can be fairly thin, yet it can set into a soft gel in the stomach, often helped by added calcium, and how strongly it gels depends on the type of alginate. That gel is the idea behind alginate drinks and capsules sold for fullness. Human results are uneven: some placebo-controlled drink studies found less hunger or lower food intake over a few days, while a capsule study and breakfast-bar study found no effect. In the largest weight trial, alginate drinks before meals for 12 weeks did not improve weight loss in the main analysis. A few small meal studies found lower post-meal blood sugar. In the US, sodium alginate is a GRAS food thickener. Alginate raft antacids such as Gaviscon are over-the-counter drugs, and heartburn relief is a drug use, not a supplement benefit.

Studied Dose Drinks or preloads before meals: an alginate-pectin drink (1.0 or 2.8 g fiber) twice daily; single preloads with 9.9 or 15 g alginate; an alginate preload (15 g fiber) three times daily for 12 weeks. 5 g with one meal in a blood sugar study. Gel strength varies by alginate type.
Active Compound Sodium alginate, the sodium salt of alginic acid, a gel-forming polysaccharide of mannuronic (M) and guluronic (G) acid units from brown seaweed; strong-gelling forms are high in guluronate.

Benefits

Appetite and fullness ratings before a meal

In 23 volunteers, a drink with 0.8% strong-gelling alginate lowered hunger ratings over 5 hours by 20 to 30% versus the same drink without it. In 20 normal-weight adults, a 15 g alginate preload raised fullness and lowered hunger. In 48 overweight adults, alginate capsules for 10 days had no effect on satiation, appetite or gut hormones.

Supported by Trial 2, Trial 3

Energy intake at later meals

In 68 adults, a strong-gelling alginate drink before meals for 7 days lowered daily energy intake by about 135 kcal (7%). In 29 overweight women, an alginate-pectin drink lowered intake at dinner, but daily intake fell only in women with low dietary restraint. Alginate added to chocolate milk or to a breakfast bar did not change intake at the next meal or over the day.

Supported by Trial 3, Trial 5

Body weight during a reduced-calorie diet

In a 12-week trial in 96 obese adults on a reduced-calorie diet, alginate drinks before meals did not improve weight or fat loss over placebo in the main intention-to-treat analysis. Only among the 80 who finished did the alginate group lose more (6.8 kg versus 5.0 kg). A 2-week pilot in 24 obese adults found no extra weight loss.

Supported by Trial 1, Trial 2

Post-meal blood sugar and insulin

In 7 men with type 2 diabetes, 5 g sodium alginate added to a meal slowed stomach emptying and gave smaller rises in glucose and insulin. In 24 healthy young men, chocolate milk with 2.5% alginate lowered peak glucose by 13% and peak insulin by 46%. Over 12 weeks of daily drinks, glucose and insulin did not differ from placebo.

Supported by Trial 5, Trial 6

Blood cholesterol and triglyceride levels

In a 28-day double-blind trial in 84 adults with high cholesterol, sodium alginate lowered total cholesterol, triglycerides and LDL more than control, with larger drops in people who started higher; the English abstract does not give the dose. In the 12-week weight trial in obese adults, blood lipids did not differ from placebo.

Supported by Trial 1, Trial 5

Mechanism of action

1

Gels in the stomach

Alginate can form a gel with calcium, which is why some products add a calcium part, so a drink that is thin in the glass can set in the stomach. On MRI, an alginate feed appeared to gel inside the stomach of healthy men. The drink studies that found lower hunger or intake used strong-gelling, high-guluronate alginates, and one group of authors noted that the alginate source and product matrix strongly affect results.

2

Stomach emptying and gut hormones

In people with type 2 diabetes, 5 g alginate with a meal slowed stomach emptying, which tracked the smaller glucose rise. A 15 g preload slowed the uptake of a gastric emptying marker. In a tube-feed study, alginate blunted GLP-1 and GIP responses and lowered PYY, so it does not appear to work by raising these hormones. Capsules for 10 days changed neither emptying nor gut hormones.

3

Holds fat and bile acids in the gut

In 6 people with an ileostomy, about 95% of a 7.5 g dose of sodium alginate passed through the stomach and small intestine undigested. It raised fat excretion by 140% and lowered bile acid excretion by 12%, which the authors linked to fatty acids being trapped in the gel. Starch and nitrogen excretion did not change.

Clinical trials

1
Alginate Preloads Before Meals With a Reduced-Calorie Diet: 12-Week RCT
PubMed

Parallel, double-blind, placebo-controlled randomized trial: an energy-restricted diet (300 kcal/day deficit) plus an alginate-based preload (15 g fiber) or placebo preload, taken as a drink three times a day before main meals. (Georg Jensen et al. 2012, Am J Clin Nutr)

96 obese adults; 80 completed the 12 weeks.

In the intention-to-treat analysis, loss of body weight and body fat did not differ between groups. Among completers, weight loss was 6.78 kg with alginate versus 5.04 kg with placebo (P = 0.03), mainly from a lower body fat percentage. Glucose, insulin, C-reactive protein, ghrelin, HOMA-IR and blood lipids did not differ, and blood pressure fell more on placebo.

2
Alginate Capsules and Satiation, Gastric Function and Gut Hormones: 10-Day RCT
PubMed

Randomized, placebo-controlled, allocation-concealed study of sodium alginate capsules from Laminaria digitata, three daily 30 minutes before the main meal for a week, then six before each test on days 8 to 10. (Odunsi et al. 2010, Obesity (Silver Spring))

48 overweight or obese adults without binge eating disorder.

No effect of alginate on gastric emptying, fasting or post-meal gastric volume, satiation, calorie or macronutrient intake at a free-choice meal, or the gut hormones ghrelin, CCK, GLP-1 and PYY. Results did not differ between overweight and obese participants. The authors questioned short-term alginate use for weight loss.

3
Strong-Gelling Alginate Drink Before Meals and Daily Energy Intake: 7-Day Crossover
PubMed

Randomized, controlled, two-way crossover in free-living adults comparing 7 days of a strong-gelling, high-guluronate sodium alginate drink taken before meals with a control. (Paxman et al. 2008, Appetite)

68 free-living men and women with a body mass index of 18.5 to 32.8.

Mean daily energy intake was 134.8 kcal (7%) lower with alginate, with lower carbohydrate, sugar, fat, saturated fat and protein intakes. The effect did not differ by sex, body mass index class or preload timing.

4
Alginate in a Low-Viscosity Meal-Replacement Drink and Hunger: Dose-Response Crossover
PubMed

Balanced-order crossover comparing a protein and calcium meal-replacement drink with 0%, 0.6% or 0.8% high-guluronate alginate; the first author's listed affiliation is Unilever Research and Development. (Peters et al. 2011, Obesity (Silver Spring))

23 volunteers.

With 0.8% alginate, the area under the curve for hunger over 5 hours was 20 to 30% lower than control (P < 0.001) on all six rating scales, and most effects were also significant at 0.6%. Simulated gastric gel strength rose with dose. The abstract reports hunger ratings only, not food intake.

5
Sodium Alginate in Chocolate Milk: Blood Sugar, Insulin and Food Intake Crossover
PubMed

Randomized crossover of 325 mL chocolate milk with 0, 1.25% or 2.5% sodium alginate, or a 2.5% alginate solution, given 2 hours before an ad libitum pizza meal. (El Khoury et al. 2014, Eur J Clin Nutr)

24 healthy men, mean age about 23 and mean BMI about 22.5.

Compared with plain chocolate milk, the 2.5% alginate milk lowered peak glucose at 30 minutes by 13% and peak insulin by 46%, and pre-meal appetite fell in a dose-dependent way. Total caloric intake at the pizza meal did not differ among treatments.

6
5 g Sodium Alginate With a Meal: Post-Meal Glucose and Gastric Emptying Crossover
PubMed

Randomized crossover of two test meals with similar carbohydrate, fat and protein, with or without 5.0 g sodium alginate, with gastric emptying measured by a radioactive marker. (Torsdottir et al. 1991, J Nutr)

7 men with well-controlled type 2 diabetes.

Alginate slowed gastric emptying and gave significantly smaller post-meal rises in blood glucose, insulin and C-peptide. The glucose response correlated with the delay in emptying (rs = 0.92). A single-meal test in 7 people; the abstract gives no glucose values.

Side effects and drug interactions

Common Potential side effects

Side effect reporting in the published alginate trials is thin: most lasted from one meal to 12 weeks, and the abstracts give little adverse event detail. In a 2-week pilot, alginate drinks were only moderately acceptable to most participants.
In a study of 6 people with an ileostomy, 7.5 g of sodium alginate raised fat excretion by 140% and increased sodium and potassium losses. Iron and manganese absorption fell in 5 of the 6 but not significantly; calcium, magnesium and zinc absorption did not change.
Sodium alginate is a sodium salt. People on a sodium-restricted diet should check the sodium content of multi-gram doses on the product label.
Alginate raft antacids such as Gaviscon are over-the-counter drugs with their own labels and warnings; they are not the same as a sodium alginate fiber supplement.

Important Drug interactions

Other oral medicines: in a study that used paracetamol (acetaminophen) as a stomach-emptying marker, a 15 g alginate preload slowed its uptake into the blood. Take medicines apart from alginate drinks and ask a pharmacist about timing.
Diabetes medicines: alginate lowered post-meal glucose and insulin in small studies, so if you use insulin or a sulfonylurea, monitor blood sugar when starting it.
Iron supplements: iron absorption fell in 5 of 6 people taking 7.5 g sodium alginate in a small study, though not significantly; taking iron at a different time is a reasonable precaution.

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Frequently asked questions about Sodium Alginate (Seaweed Fiber)

What is sodium alginate?

Sodium alginate is a soluble fiber made from brown seaweed. It is widely used as a food thickener and stabilizer, and in the US it is generally recognized as safe for that use. In supplements it is sold in drinks and capsules meant to gel in the stomach and increase fullness.

Is a sodium alginate supplement the same as an alginate antacid like Gaviscon?

No. Gaviscon-type raft products are over-the-counter drugs. In the US, Gaviscon Extra Strength tablets list aluminum hydroxide and magnesium carbonate as the active antacids, with alginic acid among the inactive ingredients. Relief of heartburn is a drug use, and a sodium alginate fiber supplement should not be used in its place.

Does sodium alginate help with weight management?

The evidence is uneven. Some short drink studies found less hunger or lower food intake, but capsules for 10 days had no effect. In the largest trial, 12 weeks of alginate drinks with a reduced-calorie diet did not improve weight loss in the main analysis, although people who finished lost about 1.7 kg more. It works, if at all, alongside diet changes.

How much sodium alginate was used in studies?

Appetite studies used drinks taken before meals, from an alginate-pectin drink with 1.0 or 2.8 grams of fiber twice a day up to single preloads with 10 to 15 grams of alginate. A blood sugar study added 5 grams to a meal. Gel strength depends on the type of alginate, so products are not interchangeable, and medicines are best taken at a different time.

What is Sodium Alginate used for?

Sodium Alginate is researched primarily for Weight Management and Metabolic Health. In 23 volunteers, a drink with 0.8% strong-gelling alginate lowered hunger ratings over 5 hours by 20 to 30% versus the same drink without it. In 20 normal-weight adults, a 15 g alginate preload raised fullness and lowered hunger.

What is the recommended dosage of Sodium Alginate?

The clinically studied dose is Drinks or preloads before meals: an alginate-pectin drink (1.0 or 2.8 g fiber) twice daily; single preloads with 9.9 or 15 g alginate; an alginate preload (15 g fiber) three times daily for 12 weeks. 5 g with one meal in a blood sugar study. Always follow the product label and check with a healthcare provider for personal advice.

Is Sodium Alginate safe, and does it have side effects?

Side effects and cautions reported for Sodium Alginate include: Side effect reporting in the published alginate trials is thin: most lasted from one meal to 12 weeks, and the abstracts give little adverse event detail. In a 2-week pilot, alginate drinks were only moderately acceptable to most participants. It may also interact with some medications. Sodium Alginate is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Sodium Alginate interact with any medications?

Possible interactions include: Other oral medicines: in a study that used paracetamol (acetaminophen) as a stomach-emptying marker, a 15 g alginate preload slowed its uptake into the blood. Take medicines apart from alginate drinks and ask a pharmacist about timing. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Sodium Alginate?

NutraSmarts rates the evidence for Sodium Alginate as Limited (2 out of 5). It is backed by 6 clinical trials and 16 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(16 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Georg Jensen M, Kristensen M, Astrup A. Effect of alginate supplementation on weight loss in obese subjects completing a 12-wk energy-restricted diet: a randomized controlled trial. Am J Clin Nutr. 2012;96(1):5-13. doi: 10.3945/ajcn.111.025312.PubMedUsed to support: Double-blind, placebo-controlled parallel trial in 96 obese adults on an energy-restricted diet (300 kcal/day deficit) plus either a placebo preload or an alginate-based preload (15 g fiber), taken as a drink three times a day before main meals for 12 weeks. In the intention-to-treat analysis, loss of body weight and fat did not differ between groups. Among the 80 completers, weight loss was greater with alginate (6.78 vs 5.04 kg), mainly from a lower body fat percentage. Glucose, insulin, C-reactive protein, ghrelin, HOMA-IR and lipids did not differ; blood pressure fell more on placebo.
  2. Georg Jensen M, Kristensen M, Astrup A. Can alginate-based preloads increase weight loss beyond calorie restriction? A pilot study in obese individuals. Appetite. 2011;57(3):601-4. doi: 10.1016/j.appet.2011.07.004.PubMedUsed to support: Randomized pilot study in 24 obese adults on a calorie-restricted diet: a 500 mL low-viscosity drink with 3% alginate taken three times daily for 2 weeks gave no extra weight loss (1.42 kg with alginate vs 1.56 kg for control). The authors concluded alginate did not enhance weight loss beyond calorie restriction and called for a larger, longer trial.
  3. Odunsi ST, Vázquez-Roque MI, Camilleri M, Papathanasopoulos A, Clark MM, Wodrich L, Lempke M, McKinzie S, Ryks M, Burton D, Zinsmeister AR. Effect of alginate on satiation, appetite, gastric function, and selected gut satiety hormones in overweight and obesity. Obesity (Silver Spring). 2010;18(8):1579-84. doi: 10.1038/oby.2009.421.PubMedUsed to support: Randomized, placebo-controlled study in 48 overweight or obese adults: sodium alginate capsules (from Laminaria digitata), three daily 30 minutes before the main meal for a week and six before testing on days 8 to 10. Alginate had no effect on gastric emptying, gastric volumes, the gut hormones ghrelin, CCK, GLP-1 and PYY, satiation, or calorie intake at a free-choice meal. The authors questioned short-term alginate use for weight loss.
  4. Georg Jensen M, Kristensen M, Belza A, Knudsen JC, Astrup A. Acute effect of alginate-based preload on satiety feelings, energy intake, and gastric emptying rate in healthy subjects. Obesity (Silver Spring). 2012;20(9):1851-8. doi: 10.1038/oby.2011.232.PubMedUsed to support: Double-blind, placebo-controlled crossover in 20 normal-weight adults. A 330 mL preload with 9.9 g alginate cut energy intake at lunch by 8.0% without changing satiety ratings. A 500 mL preload with 15.0 g alginate raised satiety and lowered hunger and slowed the rise of paracetamol in the blood (a gastric emptying marker), but its 5.5% lower energy intake was not significant. The authors called the results somewhat contradictory.
  5. Paxman JR, Richardson JC, Dettmar PW, Corfe BM. Daily ingestion of alginate reduces energy intake in free-living subjects. Appetite. 2008;51(3):713-9. doi: 10.1016/j.appet.2008.06.013.PubMedUsed to support: Randomized controlled two-way crossover in 68 free-living men and women (BMI 18.5 to 32.8): 7 days of a strong-gelling, high-guluronate sodium alginate drink taken before meals lowered mean daily energy intake by 134.8 kcal (7%) versus control, with lower carbohydrate, sugar, fat, saturated fat and protein intakes. The abstract does not state the gram dose.
  6. Pelkman CL, Navia JL, Miller AE, Pohle RJ. Novel calcium-gelled, alginate-pectin beverage reduced energy intake in nondieting overweight and obese women: interactions with dietary restraint status. Am J Clin Nutr. 2007;86(6):1595-602. doi: 10.1093/ajcn/86.5.1595.PubMedUsed to support: Double-blind, placebo-controlled within-subject study in 29 nondieting overweight and obese women. A two-part alginate-pectin and calcium drink with 1.0 g or 2.8 g fiber, taken before breakfast and mid-afternoon for 7 days, lowered food intake at dinner versus control. Lower daily energy intake (12% less with 2.8 g) was seen only in women with low rigid-restraint scores; women with high scores showed no effect.
  7. Mattes RD. Effects of a combination fiber system on appetite and energy intake in overweight humans. Physiol Behav. 2007;90(5):705-11. doi: 10.1016/j.physbeh.2006.12.009.PubMedUsed to support: Double-blind randomized crossover in overweight adults: a 55 g breakfast bar containing alginate and guar gum, eaten in place of breakfast on 5 weekdays, did not change appetite ratings over 5 hours or daily energy intake compared with a control bar. The author concluded the data did not support this fiber combination in a solid food.
  8. Peters HP, Koppert RJ, Boers HM, Ström A, Melnikov SM, Haddeman E, Schuring EA, Mela DJ, Wiseman SA. Dose-dependent suppression of hunger by a specific alginate in a low-viscosity drink formulation. Obesity (Silver Spring). 2011;19(6):1171-6. doi: 10.1038/oby.2011.63.PubMedUsed to support: Balanced-order crossover in 23 volunteers (first author affiliated with Unilever Research and Development): a low-viscosity meal-replacement drink with protein, calcium and 0.6% or 0.8% high-guluronate alginate. With 0.8% alginate, hunger area under the curve over 5 hours was 20 to 30% lower than control (P < 0.001) on all six scales, with most effects also seen at 0.6%. The authors noted that the alginate source and product matrix strongly affect efficacy. Hunger ratings only; food intake was not reported in the abstract.
  9. El Khoury D, Goff HD, Berengut S, Kubant R, Anderson GH. Effect of sodium alginate addition to chocolate milk on glycemia, insulin, appetite and food intake in healthy adult men. Eur J Clin Nutr. 2014;68(5):613-8. doi: 10.1038/ejcn.2014.53.PubMedUsed to support: Randomized crossover in 24 healthy young men given 325 mL of chocolate milk with 0, 1.25% or 2.5% sodium alginate, or a 2.5% alginate solution, 2 hours before a pizza meal. The 2.5% alginate milk lowered peak blood glucose at 30 minutes by 13% and peak insulin by 46% versus plain chocolate milk, and reduced pre-meal appetite in a dose-dependent way. Calorie intake at the pizza meal did not differ among treatments.
  10. Torsdottir I, Alpsten M, Holm G, Sandberg AS, Tölli J. A small dose of soluble alginate-fiber affects postprandial glycemia and gastric emptying in humans with diabetes. J Nutr. 1991;121(6):795-9. doi: 10.1093/jn/121.6.795.PubMedUsed to support: Randomized crossover in 7 men with well-controlled type 2 diabetes: adding 5.0 g of sodium alginate to a test meal slowed gastric emptying and gave significantly smaller post-meal rises in blood glucose, insulin and C-peptide. The glucose response tracked the delay in gastric emptying. A single-meal study in a very small group.
  11. Paxman JR, Richardson JC, Dettmar PW, Corfe BM. Alginate reduces the increased uptake of cholesterol and glucose in overweight male subjects: a pilot study. Nutr Res. 2008;28(8):501-5. doi: 10.1016/j.nutres.2008.05.008.PubMedUsed to support: Pilot crossover study in men of normal and high BMI measuring intestinal uptake of glucose, cholesterol and triacylglycerols, which rose with body fat. A 1.5 g dose of a strong-gelling alginate was associated with glucose and cholesterol uptake returning to levels seen in the leaner men. The abstract does not give the number of participants.
  12. Zhang J, Zhang Y, Zhang X, Man Q, Yang F, Li Y, Zhu M, Fan B, Tang G, Xiang X. [Lipid-lowering effect of sodium alginate in patients with hypercholesterolemia]. Wei Sheng Yan Jiu. 2025;54(3):495-499. doi: 10.19813/j.cnki.weishengyanjiu.2025.03.021.PubMedUsed to support: Randomized, double-blind controlled trial (article in Chinese) in 84 adults with total cholesterol of at least 5.2 mmol/L: 28 days of sodium alginate lowered total cholesterol, triglycerides and LDL cholesterol more than control, with larger drops in people who started higher. Body weight and BMI did not change. The English abstract does not state the dose or form.
  13. Aliyu AI, Nixon A, Hoad CL, Marciani L, Corsetti M, Aithal GP, Cordon SM, Macdonald IA, Alhussain MH, Inoue H, Yamada M, Taylor MA. A comparative, randomised MRI study of the physiological and appetitive responses to gelling (alginate) and non-gelling nasogastric tube feeds in healthy men. Br J Nutr. 2023;130(8):1316-1328. doi: 10.1017/S0007114523000302.PubMedUsed to support: Randomized crossover MRI study in 12 healthy men given a 300 mL nasogastric tube feed with or without alginate. The alginate feed appeared to gel in the stomach, gastric contents volume fell faster, small bowel water was higher, PYY was generally lower, and GLP-1 and GIP responses were blunted. Several authors list affiliations with Nestlé Research and Kaneka Corporation. A tube feed, not an oral supplement.
  14. Sandberg AS, Andersson H, Bosaeus I, Carlsson NG, Hasselblad K, Härröd M. Alginate, small bowel sterol excretion, and absorption of nutrients in ileostomy subjects. Am J Clin Nutr. 1994;60(5):751-6. doi: 10.1093/ajcn/60.5.751.PubMedUsed to support: Study in 6 people with an ileostomy on a constant low-fiber diet, with and without supplementation with 7.5 g sodium alginate. About 95% of the alginate was recovered undigested in ileostomy contents. Alginate raised fat excretion by 140%, lowered bile acid excretion by 12%, and increased sodium and potassium excretion. Iron and manganese absorption fell in 5 of 6 people but not significantly; calcium, magnesium, zinc and phosphorus absorption did not change.
  15. US Food and Drug Administration. 21 CFR 184.1724 Sodium alginate. Code of Federal Regulations. 1983;Title 21, Part 184, Section 184.1724 (47 FR 29951, July 9, 1982, as amended at 48 FR 52448, Nov. 18, 1983)..SourceUsed to support: Not PubMed-indexed; US federal regulation (read 2026). Describes sodium alginate as the sodium salt of alginic acid, a natural polyuronide from certain brown algae, and affirms it as generally recognized as safe as a food ingredient (thickener, stabilizer, texturizer and similar uses) at set maximum levels, generally 1% of most foods and up to 10% of hard candy.
  16. Haleon US Holdings LLC. Gaviscon Extra Strength (aluminum hydroxide and magnesium carbonate) tablet, chewable. Drug label. DailyMed, US National Library of Medicine. 2025;Human OTC drug label, OTC monograph M001; label updated June 2025..SourceUsed to support: Not PubMed-indexed; official US drug label on DailyMed (read 2026). Lists aluminum hydroxide 160 mg and magnesium carbonate 105 mg as the active antacid ingredients, for acid indigestion, heartburn and sour stomach, with alginic acid among the inactive ingredients. Advises asking a doctor or pharmacist before use with a prescription drug.