Yeah, I surely have some skepticism, but it's still interesting, especially when taken as a package with other studies. I wish I had access to FT - Synapsin is 100% right, the abstract is almost always misleading.
L-Arginine and Insulin Resistance:
https://www.ncbi.nlm.nih.gov/pubmed/?term=Bogdanski+P,+Suliburska+J,+Grabanska+K,+Musialik+K,+Cieslewicz+A,+Skoluda+A,+Jablecka+A.+Effect+of+3-month+L-arginine+supplementation+on+insulin+resistance+and+tumor+necrosis+factor+activity+in+patients+with+visceral+obesity.+Eur+Rev+Med+Pharmacol+Sci+2012+Jun;16(6):816-23.
https://www.ncbi.nlm.nih.gov/pubmed/?term=Long-term+oral+L-arginine+administration+improves+peripheral+and+hepatic+insulin+sensitivity+in+type+2+diabetic+patients.+Diabetes
L-Arginine Reduces Abdominal Fat in chickens (the study which probably sparked the study above in humans):
https://www.ncbi.nlm.nih.gov/pubmed/23472611
And of course, another angle - L-Citrulline has a host of studies pointing in a similar direction:
https://www.ncbi.nlm.nih.gov/pubmed/26246323
https://www.ncbi.nlm.nih.gov/pubmed/26019250
https://www.ncbi.nlm.nih.gov/pubmed/25271764
Again, sorry I don't have FT....
And of course there is some skepticism warranted. Another angle on this is - most of us probably eat more than 9 grams of L-Arginine per day above and beyond what the typical person eats just from chicken and protein powders, etc. Arginine is pretty prevalent in our diet to begin with, so supplementing may not be necessary at all if you are eating enough protein.
And it seems to be more of a health-related role. i.e. - insufficient levels may contribute to some health issues, not so much that over-dosing may reverse health issues.
I just thought it was all interesting because a lot of us are using a lot of these products already and they may have some side benefits we don't expect. Agmatine, Citrulline, etc. are amazing and contradict what most people believe about supplements - if they help your performance, they must be bad for your health. In other words, everything good has a down side and nothing is free.