Agar

Studies in people

• No harm found

  Gut bacteria and digestion²

  Agar is barely broken down by gut bacteria, and people who took agar for 12 weeks had no noticeable side effects.

• Open question

  Stomach emptying speed³

  In healthy adults, agar slowed how fast food left the stomach but did not change blood sugar.

• Benefit

  Diet effect on cholesterol⁴

  In people with type 2 diabetes, adding agar to a standard diet led to more weight loss and lower cholesterol.

Animal and lab studies only

• Benefit

  Heart and blood pressure⁸

  Agar from red seaweed contains minerals like potassium and calcium that may help meet daily needs and support heart health.

Single cases of misuse or overdose

One person or one incident, such as an accidental overdose or a mistake in a kitchen or factory. They are real, but a single case does not show what happens at normal amounts, so the signal does not count them.

• Bowel blockage⁷

  A woman who ate a lot of highly-concentrated agar got hard lumps stuck in her small bowel.

How it’s made and used

• Stomach emptying and appetite⁵

  In people, agar in jelly slowed stomach emptying and made them feel hungrier, but did not change blood sugar.

• Fruit jelly texture⁶

  In taste tests, women liked softer agar jellies best; adding xanthan made them less pleasant than pectin.

• Taste and flavour release⁹

  In lab studies, firmer agar gels needed more chewing and released less flavour, while added fat meant less chewing.

The signal at the top counts the findings in people and in animal and lab studies. A concern in studies of people outranks animal and lab studies, and “No concerns” needs at least one finding in people. When most findings in people point one way, the page leans that way (“Mostly”), and every finding is still shown. Findings whose study type is not stated are shown but not counted. This page is a reference, not medical advice. It describes what regulators and published research say. Talk to a doctor or dietitian about your own diet.

Expert panels that weigh all the research. Shown for context: the signal at the top does not count them.

• UN and WHO food additive experts (JECFA), 1973

  No daily limit needed (“ADI not specified”, JECFA’s term for very low toxicity).