Is agar-agar high in nightshades?

Nightshades status

Safe

Find out whether agar-agar is high or low in nightshades, see its exact rating, and check its FODMAP, salicylate, oxalate and diet compatibility all in one place.

Related checkers

Compare agar-agar across criteria

LectinSafe Low FermentationFit InflammationFit VeganFit VegetarianFit Paleo AIPFit

Sensitivity notes

Why nightshades food checker matters

Nightshades are a plant family including tomatoes, peppers, eggplants, and potatoes. Some people find that avoiding nightshades helps with joint pain, digestive issues, or inflammatory conditions, though research is limited.

Complete elimination for 30 days gives the clearest picture
Watch for hidden nightshades in spice blends and sauces
Paprika and cayenne are nightshades often overlooked

Triggers

NightshadesSafe

LectinSafe

Low FermentationSafe

Emulsifiers & thickenersAvoid

Diets

InflammationFit

VeganFit

VegetarianFit

Paleo AIPFit

MediterraneanFit

DASH DietFit

EoE CompatibleFit

Low FermentationFit

Priority ingredient notes

Serving size, prep, and portion notes for agar-agar

Agar agar is the gelling fibre pulled from red seaweed and sold as E406, and it is one of the very few ingredients in this database that grades clean on every single trigger column: histamine, salicylate, oxalate, nickel, sulfite, glutamate, gluten, lactose, every FODMAP group, lectins and fermentability. That surprises people who avoid seaweed, because whole seaweed is a heavyweight for salicylates and free glutamate. Agar is not whole seaweed. It is a purified galactose polymer, stripped of the compounds that make kombu and nori a problem, and human enzymes cannot break it down at all, so it passes through as inert bulk.

Watch for

It is a bulk laxative before it is anything else. Agar swells to many times its volume in water, which is exactly why a teaspoon sets a whole pan of liquid, and why taking it dry or with too little fluid can lodge in the throat or the bowel. Always dissolve and boil it into the liquid rather than swallowing powder. / Recipe quantities are tiny, usually under one percent of the dish, so the fibre load from a set dessert is small. Trouble tends to come from agar sold as a slimming or constipation supplement, where the dose is far higher. / Low iodine protocols before thyroid scanning generally ask you to drop seaweed derivatives including agar, alginate and carrageenan. Purification is not the same as removal, so follow the protocol rather than reasoning from the ingredient list. / Not a substitute for gelatin one for one. Agar sets firmer and at room temperature, so cooks who swap by weight get a rubbery result and sometimes blame the ingredient for a texture problem rather than a ratio one.

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