Methylene Blue
Beginner's Guide

Start at 5mg/day, taken in the morning with food, and hold there for at least 7 days. If it is well tolerated, step up to 10mg/day and hold that for 14 days — then stop titrating. 10mg is the target, not a waypoint, and it is the serving size most capsules on the market are sold at. The routine ceiling is 20mg/day. These are flat doses: oral methylene blue is not scaled to body weight, because every human oral study used a flat fixed dose.

No. The mg/kg figures that circulate in dosing guides come from intravenous clinical medicine — the methemoglobinemia antidote is 1-2 mg/kg IV — or from rodent injection studies. Neither converts into an oral supplement dose. Use the same 5 / 10 / 20mg schedule regardless of what you weigh.

Less than most guides imply. No published randomized controlled trial has tested chronic daily oral methylene blue in healthy adults for cognitive or mitochondrial endpoints, so the 5-10mg range is an extrapolation. What human oral data does establish: about 72% absolute oral bioavailability (Walter-Sack et al., 2009), good absorption of a 10mg oral dose in healthy men (DiSanto & Wagner, 1972), and measurable cognitive effects from single large doses of 260-280mg (Telch et al., 2014; Rodriguez et al., 2016) — doses 26 to 28 times the daily target. The 20mg ceiling is editorial judgment anchored to market serving sizes, not a study result.

Morning is preferred. Methylene blue can mildly increase alertness and cellular energy production — taking it later in the day may interfere with sleep for sensitive individuals. Take it with food; this also reduces the chance of mild nausea.

Most users report nothing noticeable for the first 2–4 weeks. Reported benefits accumulate over 4–12 weeks of consistent use. Do not judge efficacy based on the first week. The single-dose studies showing acute cognitive effects used far larger doses than any daily schedule, so they do not predict what 10mg a day feels like.

No. Staining is specific to liquid drops and sublingual troches — both of which deposit dye directly on oral tissue. Capsules bypass the mouth entirely, dissolving in the gastrointestinal tract with zero staining.

Methylene blue has known interactions with serotonergic drugs (SSRIs, SNRIs, MAOIs) — do not combine without medical supervision, and note that there is no established safe dose floor for this interaction. It is generally compatible with common supplements like magnesium, omega-3, and creatine. Consult your healthcare provider if you are on any prescription medications.

USP-grade means USP (United States Pharmacopeia) specification — 99.9%+ purity with verified absence of contaminants including heavy metals and synthesis byproducts. Industrial or lab-grade methylene blue (common in cheaper products) does not meet this standard and should not be consumed.