Quotation

Succinic acid works even better when combined with methylene blue (MB) as the combination can bypass any mitochondrial damage and produce ATP/CO2 even in very sick people. The Russian drug Cytoflavin combines succinic acid with riboflavin as the FAD from B2 can play the role of electron acceptor from succinic acid, but MB can perform that role even better and had other benefits B2 does not.