From that same link, here is some Clark contact information.
Dr. Hulda Clark 's clinic
757 Emory Street #398
Imperial Beach, CA. 91932
USA
P 01152-6646-828215 (Tijuana)
F 01152-6646-834454 (Tijuana)
Dr. Clark's clinic takes advanced patients only, mostly cancer and HIV/AIDS. Every patient must have a caregiver with them. At least one of the two must be able to understand and read fluent English. For detailed information about availability and costs and all other questions concerning the clinic contact the clinic directly. There is no email-address or web site for the clinic.