There is nothing wrong with consuming carrageenan, if it is in accordance with what we have explained in the detailed answer, and no harm will result from that.

Eating vanilla is permissible even though it was mixed with alcohol during preparation for two reasons: 1- alcohol is not najis (impure), 2- alcohol does not have any effect on vanilla.

If alcohol is fully absorbed into the food or drink and has disappeared in it, there is nothing wrong with eating or drinking such things at all. If the essence of the alcohol remains present or its traces may be detected in the mixture, it is haram to consume this food or drink.