Is Glycine worth prioritizing?

The most established use of glycine alone is sleep: real controlled studies and reviews find glycine taken before bed improves subjective sleep quality and reduces daytime sleepiness after partial sleep restriction, though the evidence base for this specific effect is relatively small. Weighing that against the numbers, Glycine is not a priority based on current data — the evidence is only emerging (18/100), and its estimated impact (15/100) is on the lower end too.