endogenous
What it isDecarboxylated arginine acting at imidazoline receptors and the NMDA polyamine site.
Why this oneIt is a putative neuromodulator that sits at the junction of the nitric oxide and glutamate systems.
What limits itHuman evidence for the supplement is limited, and oral bioavailability is poor.
NO BOXED WARNINGS
Principal riskEndogenous or dietary; no boxed warning applies
