First thing is first, diet. If you're not eating a diet loaded with micro-nutrient containing vegetables you've got an issue.
So now that we've addressed diet lets get to the nitty gritty. In parentheses is what I take specifically. Honestly, most "endurance" supplement companies have atrocious flavor systems.
Fish Oil (https://www.tigerfitness.com/...trition-mts-fish-oil
Joint Supplement (https://www.tigerfitness.com/...joint-health-formula
Greens+Multivitamin Supplement (https://www.tigerfitness.com/...riant=17535776129082
Daily Health Supplement (https://www.tigerfitness.com/...ucts/ambrosia-nektar
Depending on the day, I'll also have some whey protein.
Then I add this in during long runs and bike sessions. I like to mix my own hydration stuff with this salt supplement and the bcaa (https://www.tigerfitness.com/...nutrition-naturalyte
In regards to MTS Nutrition and Ambrosia, both are produced in NSF and GMP facilities. Although they haven't gotten Informed Choice certifications yet, the CEO is very cognizant of the legal issues that go along with the supplement industry and if they were contaminated you'd have some rights as they do work with NSF and GMP on this. Several brands that he's partnered in like HPN does have Informed Choice and Informed Sport certifications. Yes, these are all very "Bro" supplements, but this also crosses over very well to endurance.
When it comes to Fish Oil though, Costco has a bunch of different ones under the Kirkland brand that are quite adequately dosed.
Rugby Media Dude-earfulofdirt.com
Hooker training for the Sport of Scrum-Halves [Triathlon]