Are you worried how to keep L-methylfolate longer? In current market, most of the L-Mehtylfolate is not stable. You must keep it under cold temperature 2-8℃. Good news that Magnafolate® will creative you easier storage conditon. It's chemically stable last for 36months under room temperature. Please don't hesitate to contact us if you interested in the stability report or want to source a stable L-Methylfolate. Magnafolate® would be your best choice.