By what percentage do the active ingredients in Rejuvenator increase from Mild to Regular to Ultra? It doesn’t work that way. It’s not a percentage difference. However you could say if ultra is the max, medium is about half and mild is about a third of medium. Last Update: October 20, 2018 October 20, 2018 2162 FAQ’sRelated Knowledge Base Posts -How should you handle itchiness, erythema, and edema if experienced with PEPTI-a.c.n.e.?What is a Bio-Peptide?Are your products tested and approved by the FDA?