1% Methylene Blue trihydrate, demineralized water. Pharma grade ingredients: Demineralized water (EP, USP), Methylene blue (USP). Third-Party Tested. 1 vertical drop contains 0.5 mg of Methylene Blue. Directions: Mix 1 ml (20 drops) of the solution with 200 ml of water. Our premium dark amber glass bottle with glass dropper/pipette protects methylene blue from sunlight and oxidation, ensuring long-lasting purity and maximum effectiveness. Securely packed in a durable, heavy-duty cardboard tube. Tested for Heavy Metal Contamination. Upon request, a heavy metal analysis will be provided. Our product meets and exceeds USP requirements. Third-Party (USP) United States Pharmacopeia verified methylene blue incl. certificate. Our production facility is certified for GMP, ISO 22000, and ISO 22716 standards, ensuring the highest quality and compliance. ⬇⬇⬇ Please scroll down to check our Third-Party Heavy Metal analysis and other quality certificates. ⬇⬇⬇ Formaldehyde free. Methylene blue does not contain formaldehyde. Formaldehyde is a different compound that is used in industry and in some biological applications, but it is not part of the chemical composition of methylene blue. At Heiltropfen, quality and transparency are at the heart of everything we do. Every product we manufacture is tested by independent, ISO-certified laboratories to ensure purity, safety, and potency. Methylene blue is a salt used for different purposes, for scientific, analytical applications, as a dye, etc... Directions: Mix 1 ml (20 drops) of the solution with 200 ml of water. Warning: May cause skin, respiratory and eye irritation. Wash hands thoroughly after handling. Wear protective gloves/ protective clothing/eye protection/face protection. If on eye/skin wash with plenty of water. The choice of the process used and the usage is the sole responsibility of the user. This product is not intended to diagnose, cure or prevent any disease. Keep out of reach of children. Keep tightly closed in a dark, well ventilated area. Methylene blue is a highly potent dye and can cause significant staining.