Suppression and prevention of tumors and treatment of viruses

Combinations of betaine and vitamin C are used to suppress or prevent malignant tumors or to treat viruses, e.g., by combining the two ingredients in a product consumed by a human, dog, or cat, such as an aqueous liquid such as grape juice, the ingredients being provided in containers with instructions for use, or in finished products, especially with support of tests demonstrating the effectiveness of the treatment for, e.g., preventing tumors in populations known to be at risk of developing tumors, or, treating existing cancers in combination with other cancer drugs such as anastrozole and/or fulvestrant and/or artemisinin either concurrently or sequentially to prevent the cancer from growing when the cancer drug is not being used, or in the treatment of viruses.