Coenzyme Q10 be measured in blood plasma, these measurements reflect dietary intake rather than tissue status. Currently, most clinical centers measure CoQ levels in cultured skin fibroblasts, muscle biopsies, and blood mononuclear cells. Culture fibroblasts can be used also to evaluate the rate of endogenous CoQ biosynthesis, by measuring the uptake of C-labelled "p"-hydroxybenzoate. CoQ shares a biosynthetic pathway with cholesterol. The synthesis of an intermediary precursor of CoQ, mevalonate, is inhibited by some beta blockers, blood pressure-lowering medication, and statins, a class of cholesterol-lowering drugs. Statins can reduce serum levels of CoQ by up to 40%. CoQ is not approved by
Prohibition of drugs countries of a legal loopholes allowing for arbitrary arrest and prosecution. This is the result of several drugs such as Dimethyltryptamine, GHB, and morphine being illegal to possess but also inherently present in all humans as a result of endogenous synthesis. Since some jurisdictions classify possession of drugs to include having the drug present in the blood in any concentration, all residents of such countries are technically in possession of multiple illegal drugs at all times. The War on Drugs has stimulated the creation of international law enforcement agencies (such as Interpol), mostly in Western countries. This has occurred because