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 brain game with pure, potent clarity!

SHARPER MIND EVERY DAY - Clinically pure methylene blue supports cognitive clarity and memory retention.
TRAVEL READY REUSABLE - Compact 237ml bottle designed for easy dispensing and on-the-go brain support.
POTENCY PRESERVED IN GLASS - Amber glass bottle ensures maximum freshness and antioxidant protection—no plastic contamination.
TRUSTED QUALITY VERIFIED SAFETY - USP-grade, third-party tested formula with zero formaldehyde for peace of mind.
MADE IN THE USA BACKED BY SCIENCE - Crafted domestically with rigorous standards to fuel your mental edge.

This 1% pharmaceutical-grade methylene blue supplement, housed in a reusable amber glass bottle, delivers high-purity, USP-certified brain support. Third-party tested and free from formaldehyde, it offers antioxidant protection to enhance memory and mental sharpness, all proudly made in the USA.

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Brand	COMPASS LABORATORY
Material	Glass
Bottle Type	Amber Glass
Color	blue
Capacity	237 Milliliters
Age Range (Description)	Adult
Product Care Instructions	Hand Wash Only
Recommended Uses For Product	Travel
Number of Items	1
Reusability	Reusable
Finish Type	Glossy
Unit Count	8.0 Fl Oz
Package Information	Bottle
Manufacturer	Compass Laboratory
UPC	656043504328
Package Dimensions	7.68 x 4.41 x 4.33 inches
Item Weight	1.17 pounds
ASIN	B09JVXQRRP
Country of Origin	USA
Date First Available	October 5, 2021

Methylene Blue Pharmaceutical Grade, USP Grade, Third-Party Tested Brain Health Dietary Supplement for Humans, No Formaldehyde, Made in USA (1% 237ml Bottle)

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