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3-Methylfentanyl (3-MF, mefentanyl) is analogous to Fentanyl, but is far more potent. 3-Methylfentanyl is in the form of crystalline solid, the highest quality: 99,7% min. You can buy 3-Methylfentanyl online at wholesale price. Full description of the 3-Methylfentanyl below ▼