Buy 4 - MMC Crystal Powder from Auschem21 .The purity of the 4 - MMC we sell is at least 98% or higher! Buy 4 - MMC Powder, This product is for research purposes only and not for human consumption. Keep this 4 - MMC analog in a cool and dry place. Stability of research chemical 4MMC can last up to 2 years under good storage conditions.