2000 mg of l carnitine Volcarn L-Carnitine Liquid Energy, Sour Kids Candy, 32 Servings Set: L-Carnitine (Carnipure®) capsules -

This infusion is designed to be a calming, supportive experience in a comfortable clinical setting

Niciu MJ, Kelmendi B, Sanacora G (2012) Overview of glutamatergic neurotransmission in the nervous system

health mayo clinic B12 Shots & B12 Injections: Exploring the Good, Bad, and Alternative

That framing is more useful than asking which peptide is best, because the better choice depends on the type of repair-focused research you are actually interested in

Possible side effects can include redness at the injection site or reactions, depending on how the body responds

(2000): Noradrenaline, dopamine, serotonin: different effects of psychological stress on brain biogenic amines in mice and rats