Procyanidin A1 (Proanthocyanidin A1) is a procyanidin dimer, which inhibits degranulation downstream of protein kinase C activation or Ca 2+ influx from an internal store in RBL-213 cells. Procyanidin A1 has antiallergic effects. In Vivo Procyanidin A1 suppress serum IgE and IgG1 levels in mice-immunized with ovalbumin. MCE has not independently confirmed the accuracy of these methods. They are for reference only. Form:Solid