The manufacturer gains if selcon has to be replaced because 'the selcon may be bad'. This reefer may toss the old one and buy a new one.
The salmon or other fish oil capsules for humans do not say 'refrigerate after opening' either.
But, if you take a few fresh sunflower seeds, crush them and leave them unrefrigerated, within days they go bad.
That is the reason why it makes sense to refrigerate selcon. Just my opinion

Isn't it a vitamin actually vitamin c

I do not have a bottle with me but I recall that it is vitamin C in an emulsion of fatty acid stuff. I do not think refrigeration helps preserve vitamin C but I think it helps keep the fatty acid emulsion from going bad. On the other hand keeping it cool may effect the solubility so you would have to shake it before using it.

selco is just stabilized pollock or squid lipids. Needs to be refrigerated as naesco pointed out. I always shake before use because i find it always settles to the bottom.

edit: and yes it does eventually go bad after a long while. If the colour and odour still look and smell right though, then it's alright.

Do the unopened bottles need refridgeration as well?

probably. I've always refrigerated mine from the start.

Thanks for the contents info.
Leah I also put it in the fridge even if it is unopened FYI.

Thanks guy's, I will from now on