My 2c: DO NOT take MitoQ for no reason.
Why? MitoQ safety has not been fully investigated in humans. It looks like it's poorly understood in animals too. More research is needed.
http://www.cell.com/...1247(15)00521-5 (open access paper)
MitoQ also showed dose-dependent toxicity specific for neural stem cells (NSCs) and iPSCs
These results indicate that MitoQ has a narrow therapeutic window and can be harmful to stem cells at higher concentrations.
Our results indicate that the importance of ROS signaling in stem cells makes these cells also sensitive to antioxidants, with potential dose-dependent toxicity. MitoQ significantly impaired self-renewal of WT iPSCs at concentrations that were well tolerated by fibroblasts or differentiated neuronal cells, as well as the cells undergoing reprogramming, suggesting that the cellular metabolism of the latter is still partially fibroblast-like. In mouse embryos in vivo, doses improving mutator HPC phenotypes severely compromised NSC viability, raising the question of MitoQ safety for NSCs. MitoQ comprises ubiquinone, the antioxidant moiety of coenzyme-Q10, covalently linked to lipophilic TPP cation, which enables MitoQ to cross membranes efficiently and to accumulate several-hundred-fold within mitochondria in response to the organelle’s membrane potential (Murphy and Smith, 2007). Different tissues have been reported to accumulate MitoQ with different efficiencies (Rodriguez-Cuenca et al., 2010), making dose control for a specific cell type, or its mitochondria, difficult.
No previous data exist on the effects of MitoQ on stem cells.
In contrast, high concentrations of NAC did not show toxicity, which suggests to a specific feature for MitoQ and potentially for other mitochondria-accumulating antioxidants.