Carrageenan in Our Vegan Softgels: What the Research Actually Shows (and Why We Use It)
If you've ever flipped over one of our supplement bottles and spotted "carrageenan" in the "Other Ingredients" line, you may have paused. Carrageenan has a reputation online as an "inflammatory" additive, and some of you have asked us a fair question: why would a brand that makes supplements for everyday wellness use an ingredient people associate with inflammation?
We think you deserve a straight answer, not marketing spin. So here is what carrageenan is, why it's in our vegan softgel shells, what the research does and doesn't show, and where real scientific uncertainty remains.
What is carrageenan?
Carrageenan is a natural fiber extracted from red seaweed. It has been used for centuries to thicken and gel foods, and today you'll find it in plant-based milks, ice cream, yogurt, and many other products. It passes through the digestive tract without being digested and has no nutritional value. Its job is structural: it helps things gel, thicken, and hold together.
There are three main types (kappa, iota, and lambda). In the US, food-grade carrageenan is regulated by the FDA as a food additive (21 CFR 172.620). It is also on the USDA National List of non-organic ingredients that may be used in products labeled organic.
Why it's in our softgels
Most softgels are made with gelatin, which comes from animal bones and hides. We make our softgels vegan, including our Black Seed Oil Vegan Softgels and Elderberry Echinacea with Black Seed. To do that, we need a plant-based material that can form a flexible, sealed shell around an oil.
Seaweed-derived carrageenan is one of the few plant ingredients that can do this reliably. It lets the shell hold its shape, protect the oil inside from air and light, and stay stable on the shelf. In our softgels, carrageenan is part of the shell. It is not an active ingredient, and it is not in the botanical oils or extracts inside.
How much carrageenan is in our softgels?
Each of our vegan softgels contains about 5 mg of carrageenan. To put that in perspective:
- EFSA's acceptable daily intake is 75 mg per kg of body weight. For a 154 lb (70 kg) adult, that's about 5,250 mg per day. One softgel's 5 mg is roughly 0.1% of that amount.
- Even if you took several softgels a day, your intake from our shells would stay in the range of tens of milligrams.
- In foods, carrageenan is typically used at about 0.1–2% of the product's weight, so a single serving of a carrageenan-thickened food can contain many times more than a softgel shell.
We share this number because it matters. Most of the studies that raised concerns used exposures far higher than anything you'd get from a supplement shell, or used poligeenan or injection instead of food-grade carrageenan taken by mouth.
Where the "carrageenan causes inflammation" idea comes from
The concern is real, and it didn't come from nowhere. Much of it traces back to three kinds of research.
1. Confusion with poligeenan (formerly called "degraded carrageenan")
Poligeenan is a different substance. It is made by treating carrageenan with strong acid at near-boiling temperatures for hours, which breaks it into much smaller molecules. Poligeenan has caused intestinal inflammation and damage in animal studies, and it is not approved as a food additive.
For decades, poligeenan was labeled "degraded carrageenan" in the scientific literature. A 2018 review in Critical Reviews in Food Science and Nutrition found that this naming overlap caused widespread misreading of the research: harmful results from poligeenan were often attributed to food-grade carrageenan. The European Food Safety Authority (EFSA) has also stated that poligeenan is not authorized or used in food.
You may also read that your stomach turns carrageenan into poligeenan. The conditions needed to make poligeenan (very strong acid, around 190°F, sustained for hours) don't exist in the human body.
2. Lab and animal studies using unusual exposure routes
Carrageenan injected under the skin reliably produces swelling in animals. For that reason, researchers have used it for decades as a standard tool to create inflammation in lab models. That is a real effect, but it tells us about injection, not eating. Swallowed carrageenan behaves very differently: regulators have concluded that it is not absorbed intact from the gut.
A research group led by Dr. Joanne Tobacman has published cell and mouse studies reporting inflammatory and metabolic effects from carrageenan. Those findings are worth taking seriously. However, many of those studies used isolated cells, or carrageenan dissolved in drinking water without food, rather than carrageenan as people actually consume it. Reviews commissioned by industry have pointed to these design differences, and regulators weighed the studies in their evaluations.
3. Small human and observational studies
In a small 2017 trial, people with ulcerative colitis in remission followed a carrageenan-free diet. Some also took carrageenan capsules. Three of those taking carrageenan relapsed, compared with none on placebo, but only 12 people completed the study, so the result is preliminary. More recently, large French observational studies (the NutriNet-Santé cohort) have looked at emulsifiers and other food additives in relation to chronic disease. Observational studies can find associations but cannot show that a single additive causes a health outcome.
What regulators have concluded
Here is the current picture, including the parts that don't fit neatly into "totally safe" or "dangerous":
- US FDA: Carrageenan is permitted as a food additive.
- JECFA (the joint FAO/WHO expert committee): In 2015, after reviewing a large body of studies, it concluded that carrageenan in infant formula at up to 1,000 mg per liter is not of concern.
- EFSA (European Union), 2018: It found no safety concern at current use levels, but noted uncertainties in the data. It made its acceptable daily intake of 75 mg per kg of body weight temporary and asked industry to provide better data, especially on the small low-molecular-weight fraction of carrageenan. That data-gathering process is still ongoing.
- USDA Organic: In 2016, the National Organic Standards Board recommended removing carrageenan from the list of allowed non-organic ingredients. Its main reasoning was that alternatives exist for many foods. In 2018, USDA kept carrageenan on the list, citing that substitutes don't work across all uses.
Our honest summary: food-grade carrageenan is approved by major regulators worldwide, and the most alarming findings largely involve poligeenan, injection, or test conditions that don't match how people eat it. Scientists and regulators have also flagged open questions, and research continues. We would rather tell you that than pretend the debate doesn't exist.
A note on sources
Much of the published defense of carrageenan comes from industry groups such as Marinalg International, the trade association for seaweed-ingredient producers, or from researchers with industry ties. Much of the criticism comes from a small number of research groups and advocacy organizations. Neither side is automatically wrong, but that's why we give the most weight to independent regulatory reviews (FDA, JECFA, EFSA) that assess the full body of evidence.
Why we still choose it
Every softgel requires trade-offs. Gelatin would conflict with our vegan standards. Other plant-based shell systems have their own limits for oil-based formulas like black seed oil. For our vegan softgels, carrageenan is currently the plant-derived option that best protects the quality and freshness of the oils inside. We continue to follow the research and would reformulate if the scientific evidence or regulatory standards change.
Should you avoid it?
At about 5 mg per softgel, carrageenan in our shells is a very small source compared with what's in many everyday foods. If you have inflammatory bowel disease, such as ulcerative colitis or Crohn's disease, or your doctor has advised you to limit carrageenan, it's reasonable to follow that guidance and ask your healthcare provider about supplement shells. If you have questions about a specific product, contact us and we'll tell you exactly what's in it.
Frequently asked questions
Does carrageenan cause inflammation?
Injected carrageenan causes inflammation in animals, and poligeenan (degraded carrageenan) has caused intestinal damage in animal studies. Food-grade carrageenan taken by mouth is a different situation. Major regulators, including the FDA, JECFA, and EFSA, permit it in food. EFSA has noted remaining data gaps that are still being studied.
How much carrageenan is in a Zatik softgel?
About 5 mg per softgel, which is roughly 0.1% of EFSA's acceptable daily intake for a 154 lb (70 kg) adult.
Is carrageenan the same as poligeenan?
No. Poligeenan is made by breaking carrageenan down with strong acid and high heat. It is not approved for use in food, and the human digestive system cannot produce it from carrageenan.
Is carrageenan natural and vegan?
Yes. It is extracted from red seaweed, which is why it is widely used as a plant-based alternative to gelatin.
Is carrageenan allowed in organic products?
Yes. In the US, carrageenan is on the USDA National List of non-organic ingredients that may be used in products labeled organic.
Why doesn't Zatik use gelatin softgels?
Gelatin comes from animals. We make our softgels vegan, and carrageenan is one of the plant-based ingredients that makes a vegan softgel shell possible.
This article is for informational purposes only and is not a substitute for professional medical advice. Consult your healthcare provider before starting any new supplement, especially if you have a digestive condition, are pregnant or nursing, take medication, or have a medical condition. These statements have not been evaluated by the Food and Drug Administration. Our products are not intended to diagnose, treat, cure, or prevent any disease.