I've been using supplements for decades, but I'm not an expert and can just say what I use and what seems to be working for me and my husband. Neither of us are health freaks, we eat our share of what may be considered 'unhealthy' foods, and we don't exercise except for daily walks and occasional weight exercise. We also eat healthy foods, but you can't eat enough of them to get ideal health benefits and much of the produce these days aren't as nutritious due to poor depleted soils.
I'll mention some of the antioxidant supplements general dosages, nothing I do is set in stone, for example in summer months I may take a lower dose of D3 than in winter. But I'm not on any prescription drugs yet, and realize that using vitamins and supplements does not work miracles, there is diabetes, high blood pressure, etc. in my immediate family and all those folks relied on doctor's advice only, which is their preference, and I respect that. But, regular MDs are not really schooled in supplements, they learn to diagnose a condition and write a prescription.
Anyone with medical issues or on prescription drugs should always do their own research on any side effects or drug interactions when using vitamins or supplements, doctor's approval is a good idea if you're taking prescription drugs.
Below are a couple of links explaining antioxidant foods and supplements, and two of the antioxidant juices I've been using for the past few months, just an ounce a day of either. They are expensive, but can be bought at cheaper prices if you shop around, I don't take these all the time but wanted to get some extra antioxidant protection with winter approaching.
Ike, just a little information for you since you're interested.
Natural Factors CoQ10 100mg softgels - 1 per day.
Solaray B-50 Complex capsules - 1 per day
Natural Factors Lutein/Zeaxanthin 20mg softgels - 1 per day.
NOW brand natural vitamin E (d-alpha) softgels, 400IU - 1 per day.
Christian Wilde's Turmeric Formula - 2 capsules per day.
NOW Vitamin D3 2,000IU (5,000 in winter) softgels - 1 per day.
NOW Liquid lemon flavored Omega 3 Fish Oil - 1 tablespoon twice a week. I also eat salmon once a week.
Nature's Way Vitamin C (ascorbic acid) capsules 1,000mg - 1 per day.
https://draxe.com/top-10-high-antioxidant-foods/
https://www.everydayhealth.com/hs/guide-to-essential-nutrients/strengthen-your-immune-system/
http://dynamichealth.com/goji-gold-certified-organic.html
http://dynamichealth.com/mangosteen-gold-certified-organic-4fe47b.html