Hulda Clark does not sell products. Clarkia is like many of the other companies out there that sell formulas based on h.c.'s published formulas. She has stated that she is not involved with any of these companies and their claims, however her son Geoff does operate the store in San Diego. I believe that's self health resource center. That said, I'm confident that most of these sites if not all are sticking right to her published formuals. You can also look at the 2 other big clark product companies...
david over at drclark.com and Oskar over at drclarkstore.com
Clark only sells her books and her services in TJ.