... are used in the treatment of allergies. Proanthocyanidins help improve circulation by strengthening capillary walls. This is ... Proanthocyanidins inhibit enzymes that break down collagen. Proanthocyanidins help collagen repair. The breakdown of collagen is what causes ... its elasticity which in turn causes wrinkles. Proanthocyanidins help keep skin elastic, smooth and wrinkle-free. Proanthocyanidins ...