WRT to omega 3 supplementation (which I think is a good idea to balance out the surplus we get post-WWII of omega 6 fatty acids due to the shift to vegetable oils) I recommend Nordic Naturals. I buy half a years supply at a time (to avoid excessive heat or cold in shipping and to get a volume discount) and they maintain their freshness.
If you detect any rancidity you need to find another source.
For what it's worth, I too take essentially what you're taking: a private label knock off of the Centrum mature multivitamin (unless you're a menstruating woman you probably don't need iron supplementation and it can be harmful) and a fair amount of Vitamin D3, which I will be adjusting based on blood tests to figure out what's right for me.
If you detect any rancidity you need to find another source.
For what it's worth, I too take essentially what you're taking: a private label knock off of the Centrum mature multivitamin (unless you're a menstruating woman you probably don't need iron supplementation and it can be harmful) and a fair amount of Vitamin D3, which I will be adjusting based on blood tests to figure out what's right for me.