The only thing I take is Creatine Monohydrate.
Most of my fat intake comes from free range egg yolks, game meat, wild salmon and grass fed/free range beef tallow so I don't worry about Omega 3 supplements.
Depends on what your goals or requirements are I had a few rounds of antibiotics after some major surgeries, I've been taking probiotics regularly for over a year and am just now getting labs where I want them. I've been using Primal Blueprint and have been very happy.
Eat more fish. It will be cheaper and more effective than buying that crap they sell in stores. All that stuff is loaded with filler. You're after the EPA and DHA.. take a look on the back of those bottles and you'll see a lot of "other fish oils" ... eating fish is the best way to get your fatty acids, plus you get a healthy amount of protein.
+1 for the Kirkland or any Fish Oils from Costco. Half the price for similar amounts of DHA/EPA when I compared a few bottles from GNC back in the day. It's cheap enough from Costco, I buy it for my dogs as well, 2 a day for the pups for a healthy heart.