urn1.1 to 1.66 mg per 2.2 lbs (1 kg) of body weight per day during periods of high sun exposure[2 stars] Proanthocyanidins are a group of flavonoids found in pine bark, grape seed, and other plant sources that may increase the amount of ultraviolet rays necessary to cause sunburn.Learn MoreClosePancreatic InsufficiencyRefer to label instructions