In recent years, betaine has been tested in many clinical tests aimed at its use in athletes. One of the first studies was conducted at Connecticut University in 2010. It was found that athletes who took 1.25 g of betaine twice daily increased their strength by 25% and muscle by 20%. It was also confirmed that betaine significantly increased factors affecting protein synthesis in muscles compared to placebo.
Research has also shown that betaine has the ability to raise the levels of important anabolic agents while affecting the level of cortisol catabolic hormone. This leads to an increase in power and endurance performance.