As of 2015, no scientific evidence suggests that there is a natural cure for bladder cancer, according to the National Institutes of Health. WebMD lists several common vitamins and supplements used to treat the symptoms of bladder cancer, but there is insufficient evidence to confirm their effectiveness.
Of the vitamins and supplements listed on WebMD, green or black tea, rhodiola and vitamin C are positively reviewed by users. Vitamin E is the only item listed as possibly effective. Healing Cancer Naturally has positive testimonials on the effectiveness of Dr. Johanna Budwig's "Healing Diet and Protocol," but no scientific evidence is provided.