However, my statement was on 2 articles I read earlier this year from the Annals of Internal Medicine and the Journal of the American Medical Association. Dozens of similar studies have been published. These studies have to go through a stringent peer-review process and have to provide evidence that they are not self-serving.
But it can be confusing. And there's room for different opinions. My own view, which I stated above, was that a basic multivitamin (used with tempered expectations) might be reasonable. For anything beyond that, I'd talk to your doctor.
(Tongue-in-cheek warning) Oh ... and the question is not whether global warming exists today. No one doubts this. Just like no one doubts that global warming occurred many times in the past. The question for debate is whether people's actions are causing it.