We don't know exactly how much glycine is present here, but the research literature generally attests to the efficacy of relatively small doses i.e
Administration of high-fat diet promotes the production of ROS, along with the elevation of tumor necrosis factor-alpha (TNF-) and adipokine secretion, thereby resulting in chronic inflammation [41]
Iranian Journal of Basic Medical Sciences, 20 (5), 557-568
Research suggests it may help promote blood flow, encourage new blood vessel formation, support collagen production, and help regulate inflammation
Black Cherry Vanilla - Rich Decadent Delicious
And though the stroke data is considered interesting, there isnt clinical evidence that it boosts mental clarity or focus