We had a craze on the Ray Peat Forum where a few members started to take ascorbic acid reacted with methylene blue for being mesmerized by the change in color. Consider this:
5.68 mmol/1 g ascorbic acid
For a single reaction, this would call for 1.8 g of methylene blue per gram of ascorbic acid. People take methylene blue on the low mg range or even less, such as 150 mcg (0.00015 g). It's likely that they're downing the instant solution with only a small fraction of vitamin C oxidized. Note that the reason why they combine them is to consume preoxidized vitamin C.
And this is without taking into account the multiple cycles that ascorbate undergoes in the body, making external manipulations of low doses somewhat redundant. Also, that the pharmacological uses for a considerable oxidative burst are way off from their method:
Review of high-dose intravenous vitamin C as an anticancer agent
"Vitamin C has different functions at physiological and pharmacological plasma concentrations. Oral vitamin C administration is associated with tightly controlled plasma concentrations regulated by the pharmacokinetic principles of bioavailability and clearance.[7] Saturation of bioavailability mechanisms occurs at oral doses of 400 mg daily equating to blood levels of 60–100 μM.[8] IV dosing bypasses this tight control, achieving plasma concentrations up to 20 mM.[7,8]
In vitro evidence suggests plasma concentrations of 10 mM are necessary for an antitumor effect and this appears achievable clinically only with IV administration.[8] Padayatty et al. postulated that the vitamin C-free radical species, ascorbyl radical, forms only when human plasma concentrations are greater than 10 mM and that it is this radical or its unpaired electron that induces oxidative damage in cancer cells.[8]
Casciari et al. published a trial to determine the dose necessary to achieve this level in humans.[57] In a single patient with colon cancer, they found that a dose of 60 g but not 30 g was effective at attaining this. A recent phase I trial of 24 patients demonstrated that IV vitamin C to a dose level of 1.5 g/kg three times per week was safe and achieved plasma concentrations >10 mM for several hours.[58] While average follow-up was only 10 weeks, this trial did not demonstrate objective tumor response at these levels.[58] Riordan et al. published a series of 24 patients treated with IV vitamin C 150 mg/ kg/day and 710 mg/kg/day.[59] The mean plasma level was 1.1 mM (below the expected therapeutic target). They did not demonstrate a correlation between dose and plasma concentration. The reason for this is unclear. Other factors such as critical illness, renal function and chemotherapy regimens may alter plasma vitamin C concentrations and affect the plasma concentration necessary for cytotoxicity.[58]"
You can find different values depending on the source, incomplete stalling, and ways to lower the effective dose, but the point is that to stand a chance to induce oxidative stress in distant cancer cells, the acute amount is much higher.
Ray was concerned about contaminants in synthetic ascorbic acid and would possibly sweat at the idea of combining it with an oxidant. Member 'jyb' alerted that methylene blue products can also be contaminated. It seems better to take them separately and renew the vitamin C dose often when you can't brutalize.
Related to the previous topic, Max Gerson and Ray endorsed niacin supplementation, but in moderate and repeated doses. Max recommended niacin (50 mg*) along with vitamin C (500 mg*) and aspirin (325 mg*), to be used orally multiple times a day. *If I'm not wrong.
