Methylene blue is a dye that has been used throughout history for a variety of scientific applications. Our specially-formulated methylene blue is USP/Pharmaceutical Grade, GMO-free, gluten-free, and formaldehyde-free. It comes in a 59 mL glass bottle for easy dispensing and potency preservation. Our products undergo rigorous testing to ensure consistency and quality. We pride ourselves on the quality of our ingredients and we just know you'll love your results! We're here to help you make the choice for a healthier lifestyle. Consult your healthcare practitioner prior to use. Not for pregnant or nursing women.