Vitamin C: take as much as you need to feel right; it is safer than water; there is no lethal dose.
Vitamin D: keep your blood level at 50-100 ng/ml; you need a blood test to really know. Rule of thumb: average people 4000-5000 IU/day, indoor people 7000-8000 IU/day, outdoor people 2000-3000 IU day.
B-vitamins: A good multivitamin should cover this; I take Life Extension’s 2 per day, and also add 500 mg niacinamide + 100 mg niacin.
Zinc: 30-50 mg/day
Magnesium: ~400 mg/day
Boron ~3 mg/day
Chromium: 200 mcg/day
Selenium 200 mcg/day
Calcium/Iron: do not supplement; you will get enough in your diet, and overdose is toxic!
Copper: a tiny amount mixed with zinc is OK, otherwise do not supplement, it can also be toxic.
Coenzyme Q10: 100mg ubiquinone or 50 mg ubiquinol as soft gel; take more if you need more for energy.
PQQ: 20 mg/day or more for mitochondrial health.
Omega-3 fat: eat fish/flax or take capsules, but be sure your diet contains some.
Good luck with your health.
Gotta take the Vitamin K with the D. For every 1000IUs of D or D3, take 100mcg of K2-MK7 and 100mcg of K2-MK4. Or eat a whole bunch of Broccoli or Spinach with some fat.