I was about to say when I read the title, just about everything destroys mitochondria. However, there are a lot of things we can do the repair mitochondria health. Supplements like NMN or NAD+, inositol, COQ10 (ubiqinol), methylene blue, vitamin B complex, vitamin K2+D3, vitamin E, SLU-PP-332, MOTS-C, etc... Some of these are fairly cheap, but things like NMN, NAD+, Ubinqinol, Methylene Blue, SLU-PP-332 and MOTS-C can get pretty damn expensive. My mitochondrial health stack runs $350 a month.