Borax Protocol and Kidney Disease

I've been taking the borax protocol for my arthritis since March of this year and I feel like it is really helping me. My sister is considering taking it for the same reason however, she was diagnosed with kidney disease stage 2 (initial diagnosis was stage 3A but they have since down-graded it). In reading about side effects of taking the protocol, I've seen things related to the kidney and am wondering if she would be ok taking the protocol with her diagnosis. Any insight anyone can offer is greatly appreciated. Thanks, Pam