how many drops in a mL?

10 drops = 5 Mg, 2 x day is the usual dose. The literature works in Mg rather than Ml.

There is no contact number for compass lab, although they state that a certificate of analysis is available on request. why not just publish it here?

You can simply send a message through Amazon but the certificate is also available in the pictures section.

237 ml is 8 oz. size in discription is 50 ml. is it one 237 ml bottle or five 50ml bottles?

It is one 237ml bottle. I ordered the 50ml bottle initially but realized I would need the larger bottle if I wanted to take Methylene Blue in the larger doses I need. I'm taking 20 drops twice a day at present so am going through the 50ml bottle in 3 - 4 weeks. Loving the results so far. Greatly helps my short term memory issues.

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🧠 Elevate your mind, one drop at a time.

LAB GRADE PURITY - USP-certified formula ensures pharmaceutical-grade quality you can trust for your brain health regimen.
ANTIOXIDANT DEFENSE - Neutralizes free radicals to protect and prolong the vitality of your brain cells.
SLEEK SUSTAINABLE - Generous 237 mL glass bottle designed for eco-conscious professionals who value quality and style.
PRECISION BRAIN FUEL - Each drop delivers a potent 0.5 mg dose of high-purity methylene blue for targeted cognitive support.
MITOCHONDRIAL POWER BOOST - Enhances ATP production to supercharge cellular energy and sharpen mental clarity.

Compass Laboratory Methylene Blue 1% is a USP-grade, high-purity cognitive supplement delivered in a 237 mL glass bottle. Each drop contains 0.5 mg of methylene blue, designed to cross the blood-brain barrier, boost mitochondrial ATP production, and provide antioxidant protection to support brain function and memory longevity.

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€ 391.47

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Package Dimensions	19.2 x 13.69 x 10.9 cm; 540 g
Item Weight	0.54 Kilograms
Item volume	237 Milliliters
Finish types	Glossy
Care instructions	Hand Wash
Number of pieces	1
Batteries required	No

COMPASS LABORATORY Methylene Blue 1% | USP Grade | Large Refill Bottle | 1 drop contains 0.5 mg Methylene Blue | 250 mL Glass Bottle

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