Second Generation GcMAF is stable for a minimum of 2 weeks at room temperature. See our Stability of GcMAF in Serum (PDF) report produced by Tokushima University.
We completed a longer stability experiment which found that Second Generation GcMAF is stable for 4 weeks at room temperature without loss in macrophage activation activity so the GcMAF remains highly potent.
We estimate from our experiments that our GcMAF remains highly active without loss in activity for at least 1 month at room temperature. Refrigerated there is no loss in activity for over 1 year.