Hi Patischof, welcome to the forum I've created a new thread for your post, since we discourage reviving threads that have been quiet for more than a few months. You can read our full forum guidelines here. A Labrador on a nutritionally complete kibble or canned food won't usually need any extra supplements, unless their vet suggests it. Lots of Lab owners give their senior dogs a vet-approved joint supplement, for example. If you're feeding raw or homemade food, your vet can also advise whether they need any extra vitamins to make it nutritionally complete. I'd also be interested to hear whether our other members give their Labs any vitamins or dietary supplements - hopefully you'll get some more responses soon!
I have always fed my dogs a dry complete and not supplemented with anything. All lived long healthy lives.