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"Proteins" is not one thing, it's a class of many different things made from amino acids. Same as the "peptide" craze you might have heard of, except proteins are bigger.

Antibodies don't have to bind only to proteins, it could be some lipid, carbohydrate, any molecule big enough. Most of the time it's some protein, but it's not an allergy proteins in general.

Basically any chemical structure beyond a certain size can cause an allergy. It doesn't even have to be an organic compund.

I wondered if you'd be allergic to Surströmming. I haven't had the privilege to try it yet.

One man’s privilege; another man’s punishment :D

I absolutely cannot take that smell.

It’s pretty common in Sweden and not too expensive. I bought from ICA last time I tried it.

Plenty of places ship internationally AFAICT

https://swedishgoods.co.uk/shop/ <- this one for instance