I’ll try to dig up some studies, but almost every study I have read has shown that “multi” vitamins slightly reduce lifespan. Certain individual vitiamins and minerals (and combinations) increase life span. The range is roughly -1.5% for multis and +1.5% for individual supps. One issue is that people can get iron related deaths. There also may be bleeding or clotting problems.
Some supps that increase life span (statistically): vitamin c, vitamin d, zinc, magnesium, iodine. If you took those 5 you would probably have the greatest statistical net, and it is very hard to overdose on them.
Vitamin A is good, but you can overdo it. Many have low copper, but too much copper can actually inhibit some copper containing enzymes because I think it blocks zinc that is also present in them. So pretty much everything else can be too low OR too high.