Vitamin B5 Panthothenic Acid in Diet & holistic health Posted October 25, 2009 thanks for the comments. Is it normal for I to purge the first week. I noticed that some areas got much better however, I got really concerned because I got a huge cyst on my right cheek. It looked like I was in a fight. Are all these normal? Also, the brand I am using is Pantothenic Acid from GNC, is that a good brand?Just to clear a few things. I know that if you suddenly stop taking B5 after taking large dosage that it can make your acne worse. Does that mean, I should lower the dosage slowly so that my body doesnt react to a sudden change?