I agree your diet to cover all the vitamins you need. I still take Vitamin D and Magnesium supplements though. Vitamin D because when I had a BUPA healthcheck they advised I should wear sunscreen on my face on sunny days, even in winter! This is because men my age are susceptible to skin cancer. I mentioned Vitamin D and he said I could take a supplement so now I do.
I take magnesium as I had Achilles tendonitis from running. I literally had it a year and thought it would be with me forever so just learned to live with it. I read that magnesium can help your tendons repair themselves so I gave it a go. The condition is gone now but I think that's more due to better muscle balance in my legs and doing regular Pilates though but the magnesium may have played a part. I still take it as I bought 2 years worth with the Boots 3-for-2 deal.
Epsom salt baths are great post-workout especially after leg day, I do foot baths often before bed, makes me feel more relaxed and releases tension.
I take Vitamin D + K2 usually in liquid form with olive oil. K2 prevents calcium from building up in your artery walls.
Timing of vitamins matter, some you should take in morning and some before before bed and there are some you should never take together. (Morning - Vitamin B complex, Vitamin C and evening - Zinc, Magnesium, Vitamin D)
Typically whenever you look at the ingredients list on supplements and "Calcium carbonate" is first on the list then it's usually cheap rubbish. It's always better to buy it in liquid or powder form.