My diet:
Comparison

Carrageenan vs Agar-Agar

The short answer
Agar-agar is the cleaner choice with no health questions. Carrageenan gives a softer, creamier texture in dairy, but has unresolved questions about gut inflammation.
Side by sideCarrageenanAgar-Agar
Safety score58/100 Use in moderation95/100 Generally safe
SourceRed seaweedRed seaweed
TextureSoft, creamyFirm, brittle
Best forDairy & plant milksJellies & gummies
Gut health questionsYesNo ✓ Better
Safety score5895 ✓ Better

Swapping one for the other

Agar sets much firmer, so use about a third of the amount when replacing carrageenan in desserts.

Common questions

Are they both vegan?

Yes. Both come from seaweed.