Are supplements worth it if you’re unable to get them purely from food?

I barely eat fish. Most of my diet consists of chicken, rice, french fries , grains, fruit , peanut butter, and protein powder. It is very repetitive but it’s what I have time for, and what I can afford. I found some omega-3 capsules with added vitamins/minerals and I’m thinking about buying them. I just want to know that I am not wasting my money as this would be an average monthly cost of 13 euros.

I’m thinking 2 multi omega-3 capsules + 1 high concentration omega-3 capsule . ) I know the price might seem high but I live in an expensive country.

Here is the nutrition information for the multivitamin the other capsules are pure omega-3, sorry for any potential spelling mistakes, google translate had to do:

Two capsules contain: 250 μg RE vitamin A , 10 μg vitamin D , 75 mg vitamin C , 10 mg α-TE vitamin E , 120 μg vitamin K , 1.6 mg vitamin B6 , 400 μg folate , 2 μg vitamin B12 , 19 mg NE niacin , 1, 4 mg vitamin B1 , 1.6 mg vitamin B2 , 5 mg pantothenic acid , 15 mg iron , 150 μg iodine , 12 mg wash , 100 mg magnesium , 60 μg selenium , 2.3 mg manganese , 35 μg chromium , 900 μg copper , 45 μg molybdenum , 866 mg omega-3

Thanks for any help you’re willing to provide, I really appreciate it!

Are supplements worth it if you’re unable to get them purely from food?