Ergothioneine in mushrooms (oyster, shiitake, maitake, etc.) is the easy way to dietarily amp up mitochondrial antioxidants to prevent damage from happening. As supplements, CoQ10 and ubiquinol (7x better absorbed than CoQ10) minimally help mitochondrial free radicals. MitoQ directly helps, but is expensive. PQQ actually makes new, young mitochondria spontaneously appear alongside damaged mitochondria. Nicotinamide riboside might help regenerate damaged mitochondria.
I live close to Trader Joe and get some of my nutritional supplements there, including CoEnzyme Q-10 (Ubiquinone) 100 mg. I take about 10 different supplements a day and at 82, am actually stronger than I’ve ever been, easy to tell because I do weights at the gym at least 3x/week. Plus walk a fast mile every day, on the treadmill at gym, to the store on the other days. My doctor actually. prescribes supplements for me so they are deductible.
More on CoQ10 at Dr. Axe, who researches these things mainly at Oregon State University where they do the testing: https://draxe.com/all-about-coq10/
Veto! (The girl)
There are over 4000 mitochondria in a cardiac cell, and smaller but numerous amounts in other cells.
Since mitochondria originated as symbiotic bacteria, we are mostly made of bacteria. Think about that the next time you read a Florida Man story.
You can amp up the creation of mitochondria by
1.)sitting in a sauna.
2.)swimming in cold water
3.) HIIT High Intensity Interval Training
4.)Fasting
5.)Supplementation: NAD+, PQQ, COQ10