At 50 mg per ml, this solution is the most concentrated form of 4-PrO-MET in the range. High Dose 4-PrO-MET Drops hold about 2.8 mg per drop, where the Microdose drops hold about 0.3 mg. One millilitre contains as much 4-PrO-MET as 25 Microdose pellets of 2 mg.

At this concentration, a small difference in volume means a large difference in quantity. Drop size also varies with the dropper and the angle at which the bottle is held. For precise work, measure by volume with a graduated pipette and do not rely on counting drops.

Research setups that call for small quantities are better served by the Microdose 4-PrO-MET Drops with 6 mg per ml or the Microdose 4-PrO-MET Pellets with 2 mg each. For a high quantity in solid form, see the High Dose 4-PrO-MET Pellets with 20 mg each. Background on 4-PrO-MET, its relation to 4-HO-MET and its legal status can be found on the category page.

Keep the bottle upright in a cool, dark place, preferably refrigerated, and close the cap directly after use. 4-PrO-MET is a variant of 4-HO-MET with a small propionyl group attached, and in a water-based solution that group can gradually split off. Cool storage slows this process down.

The colour of the liquid may change over time. This is a known process for tryptamines in solution.

• Substance: 4-PrO-MET (O-propionyl-4-HO-MET)
• Chemical name: 4-propionyloxy-N-methyl-N-ethyltryptamine
• CAS number: 3104587-26-7
• Strength: High Dose, 50 mg per ml
• Format: liquid research solution, 2 ml, 5 ml or 10 ml
• Storage: cool, dark and upright, cap tightly closed
• Intended use: analytical, educational and scientific research only

How much 4-PrO-MET is in one drop?

About 2.8 mg, based on roughly 18 drops per ml at a concentration of 50 mg per ml. Drop size varies, so this is an approximation and not a unit to measure with.

What is the difference between the 2 ml, 5 ml and 10 ml bottles?

Only the volume. All three contain the same solution of 50 mg per ml: 100 mg 4-PrO-MET in total in the 2 ml bottle, 250 mg in the 5 ml bottle and 500 mg in the 10 ml bottle.

What is the solution made of?

Demineralised water with 10% alcohol, in which the 4-PrO-MET is dissolved. It is the same base as used for the 4-HO-MET drops.

Are these the same as the high dose 4-HO-MET drops?

No. Both contain 50 mg per ml and come in 5 ml and 10 ml bottles, but they hold different substances. 4-PrO-MET is a closely related variant of 4-HO-MET, and the two have a different legal status in several countries.

• Wikipedia: 4-PrO-MET
• PubChem: 4-PrO-MET (CID 169222171)
• Dutch Opium Act (Opiumwet), wetten.overheid.nl

This product is intended exclusively for analytical, educational and scientific research.
Not for human or animal consumption.
Not suitable for minors.

• Contains a high concentration of a research chemical. Handle with care.
• Keep out of reach of children.
• May cause irritation of the respiratory tract and eyes.
• Avoid release into the environment.
• In case of contact with eyes or skin, rinse with water. After inhalation, move to fresh air.