is it safe to take a product if container say "manufactured in a facility that also proccesses shellfish?

If you're not allergic to iodine or shellfish. 

It's a notice for those people. 

Facilities that process peanuts also give warnings to non-peanut products that were processed in the same facility.

Only if you're not allergic to shellfish.

Only if you are not sensitive to shellfish.

It's simply a warning for anyone who is allergic to shellfish. If you don't have an allergy to shellfish, there's nothing to worry about. If you DO have an allergy, there's probably very little risk, but they are obliged by law to warn you that a risk does exist.

If you are not allergic to shellfish, sure

If you ARE allergic to shellfish, it may not be

ask your doctor about it