I use the alpha ketoglutarate pre and post workout for vasculation via NOS.
But I use the pyroglutamate pre bed as it s proported to be the best for promoting GH release as it crosses the blood brain barrier.
Arginine pyroglutamate, in addition to having cognitive enhancing effects, is an excellent growth hormone releaser because it is carried more efficiently across the blood- brain barrier than arginine alone. In Italy, this form of the amino acid is used to treat senility, mental retardation, and alcoholism. Arginine pyroglutamate is an arginine molecule combined with a pyroglutamate molecule. L-Arginine alone does not produce cognitive enhancing effects.
L-Arginine