If it's all about the NO and not the other effects of L-Arginine, L-Citrulline might be the superior option.

"Ingested L-arginine is first delivered to the intestines and liver where arginase, which converts L-arginine to ornithine and urea, is concentrated. In contrast, L-citrulline avoids intestinal or liver metabolism and enters the kidneys, where it is rapidly converted into L-arginine"

https://lmreview.com/wp-content/uploads/2018/07/Citrulline-A...

https://lmreview.com/l-citrulline-restoring-erectile-functio...