Methylene blue

Methylene blue is a multifunctional dye that Peat identified as a potent blocker of nitric oxide production, acting through at least six distinct mechanisms including the prevention of excitotoxic damage and the inhibition of excess microtubule polymerization. 1 He considered it a valuable emergency substance for turning off the massive over-production of nitric oxide, alongside more commonly available substances like niacinamide and progesterone. 3 Its core therapeutic action lies in its ability to act as an electron cycling agent, receiving electrons from carriers like NADH and passing them directly to functional parts of the mitochondrion, effectively bypassing damaged segments of the electron transport chain to restore energy production. 2

At the molecular level, methylene blue oxidizes critical sulfur groups on glutamate receptors, turning off the excitotoxic process that otherwise leads to cell death through nitric oxide synthesis. 4 Dinkov has elaborated that this oxidizing power is central to its benefit, noting that most people exist in an excessively reduced state, and that the oxidized form of methylene blue is required to restore proper electron flow and activate cytochrome C activity. 9 He further explained that methylene blue can substitute for oxygen as the final electron acceptor, re-oxidizing NADH back to NAD and thereby lowering the expression of lactate dehydrogenase, a nonspecific biomarker overexpressed in every type of cancer. 11 This allows the substance to reach cells in a state of chronic hypoxia that oxygen itself cannot adequately supply. 2

Peat observed remarkably potent effects at very low doses, noting that a well-controlled study found 15 mg per day sufficient to relieve severe depression, while he personally suspected that optimal doses might be analogous to thyroid hormone, in the range of 20 to 40 micrograms daily. 2 He reported that many people were experiencing powerful antidepressant effects from just one milligram per day, and that it could resolve insomnia by restoring mitochondrial energy production and lowering nitric oxide. 2 Toxicity studies have shown an extraordinary safety profile; lifespan studies in rodents using doses equivalent to several grams per day in humans showed no life-shortening effects, and in female mice, the highest doses actually extended maximum lifespan. 2

Despite its safety, specific cautions exist. Peat warned that in an iron overload state, methylene blue, like ascorbic acid, can reduce ferric iron to the ferrous form, generating the most toxic free radicals. 5 Dinkov has emphasized that methylene blue is a relatively strong monoamine oxidase type A inhibitor, which decreases serotonin degradation and can lead to dangerous serotonin syndrome when combined with SSRI drugs or other serotonergic substances, particularly at the high injected doses used for treating shock. 7 For human use, sourcing a USP-grade product is recommended, as the substance is widely sold as a fish tank treatment and questions of heavy metal contamination in non-pharmaceutical grades have been raised. 2