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

Product ID: 391752614

Details

Age Range (Description)
Adult
Brand
COMPASS
Color
Blue
Global Trade Identification Number
Item Form
Liquid
Manufacturer
Compass

🧠1% pure USP-grade methylene blue

🧪Third-party tested for potency & purity

🛡️No formaldehyde, antioxidant-rich formula

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Description

🧠 Elevate your brain game with every drop — don’t get left behind!

CLEAN SAFE FORMULA - Free from formaldehyde and harmful additives for your brain’s health.
LAB TESTED CONFIDENCE - Third-party verification ensures pharmaceutical-grade quality you can trust.
SHARPER MIND EVERY DROP - Clinically pure 1% methylene blue supports cognitive clarity and memory retention.
POTENCY PRESERVED IN GLASS - Premium glass bottle packaging locks in freshness and prevents degradation.
MADE IN THE USA TRUSTED WORLDWIDE - Crafted under strict USP standards for uncompromising quality.

This 1% pharmaceutical-grade methylene blue supplement, made in the USA and third-party tested, delivers a potent antioxidant formula designed to support brain health and memory. Packaged in a glass bottle to preserve purity, it contains no formaldehyde and meets USP standards, making it a trusted choice for cognitive enhancement.

Specifications

ASIN	B09JVXQRRP
ASIN	B09JVXQRRP
Age Range Description	Adult
Best Sellers Rank	#55,981 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #443 in Lab Chemicals
Brand Name	COMPASS LABORATORY
Color	Blue
Container Type	Bottle
Customer Reviews	4.6 4.6 out of 5 stars (100)
Date First Available	October 5, 2021
Global Trade Identification Number	00656043504328
Item Form	Liquid
Item model number	2021-1B
Manufacturer	Compass Laboratory
Manufacturer	Compass Laboratory
Manufacturer Part Number	2021-1B
Model Number	2021-1B
Number of Items	1
Package Dimensions	7.09 x 3.66 x 3.58 inches; 15.52 ounces
UPC	656043504328
Unit Count	8.00 Fluid Ounces

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161650CFA

Duties & taxes included

In stock

Sold byAmazon Cote D' IvoireDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Cote D' Ivoire.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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