Q&A: What’s zinc PCA and how do I formulate with it? (#alltheingredients)

In the July Q&A, Charlette asked, I’ve been looking into developing some skincare for acne/break out prone skin. I’ve been reading about Zinc PCA-but cannot find it ANYWHERE among our usual wonderful suppliers. I ended up requesting samples on Knowde. From what I read-it is not the same as Zinc Oxide? Do you have any suggestions…