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Carnitine supplements may be advisable in such situations

[DOI] [PubMed] [Google Scholar] 2.European Commission Health and Food Safety Opinion on Caffeine, Taurine and D-Glucurono--Lactone as Constituents of So-Called Energy Drinks

Yes, 3300mg is safe for healthy adults

The DSM-5 defined 3 severity levels which depend on the requiring support

Functional studies indicate that glutathione peroxidase activity saturates at 7090 g/L serum selenium, further explaining why supplementation beyond this threshold may not enhance antioxidant capacity ( 5.4 Practical considerations In selenium-replete populations, large trials (e.g., SELECT) found no reduction in cardiovascular events with 200 g/day of selenomethionine and even observed a potential rise in type 2 diabetes incidence (Zhang et al., 2017)

C-II activity, Complex II Activity