l arginine studies

l arginine studies
L-lysine and L-Arginine?

I read online that arginine and lysine L L promote the HGH (Human Growth Hormone). There was a study that found that combination of the 2 amino acids are 10 times more effective than taking arginine alone (some items that must be added lysine and no "L-Lysine. They say that L arginine and lysine L are contraindicated receptors, ie, compete with other, and if taken together, will have no effect. I was looking for some articles to differentialte between L Lysine and lysine, but some items like that on Wikipedia, even used interchangeably (same). So which is which? And how do you differentiate between L Lysine and Lysine?