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From another article:
"Exogenous arginine is required for growth in some argininosuccinate synthetase (ASS)-deficient cancers. Arginine deiminase (ADI) inhibits growth in various ASS-deficient cancers by depleting arginine. "
Around 35 years ago, 15 years after I became interested in the use of supplements to improve health, a friend had an attack of shingles (herpes zoster). With book research I discovered something called the lysine/arginine ratio. My friend bought some lysine to take which helped the shingles heal quickly. Lysine is also helpful for herpes simplex attacks—cold sores, and genital herpes. I turns out my friend had recently changed his diet and was talking a lot of something (I think brewers yeast powder) which was supplying too much arginine in his diet. So what may be good for herpes viruses may also be good for combination therapy with virus caused cancers.