👉 Betaine, also known as L-arginine, is a naturally occurring amino acid found in plants and some animals. It's crucial for various biological processes including protein synthesis, enzyme activity, and cell function. Betaine is essential for the production of neurotransmitters like dopamine and serotonin, which are involved in mood regulation and cognitive functions. Betaine also plays a role in muscle contraction by acting as an amino acid that binds to myofilin proteins, which play important roles in muscle contraction.