Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Glycine is a non-essential amino acid that has recently gained attention as a potential supplement for athletic and exercise performance. Scientific studies have explored glycine’s roles in muscle protein synthesis, creatine production, and as a component of collagen, which is important for connective tissue health. Some evidence suggests glycine may help reduce oxidative stress and inflammation associated with intense exercise, potentially aiding in recovery. Furthermore, glycine has been observed to improve sleep quality, which can indirectly benefit athletic performance through better recovery.

However, human clinical trials directly evaluating glycine supplementation for improvements in strength, endurance, or exercise recovery are limited. Most studies use small sample sizes or animal models, and the results are mixed. While glycine is sometimes included in multi-ingredient supplements marketed for exercise aids, its independent effects remain uncertain.

Overall, the rationale for using glycine in sports nutrition is grounded in its physiological roles and some promising early research. Still, the current level of evidence supporting its direct ergogenic (performance-enhancing) effects is modest. More large-scale, high-quality human studies are needed to validate glycine’s effectiveness as an athletic aid. For now, its use is best considered as experimental, with a moderate but not robust scientific basis.

More about L-glycine
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Other ingredients used for Athletic and Exercise Aids

Other health conditions supported by L-glycine

Products containing L-glycine

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Metagenics Clear Change 28-Day Detox Program with UltraClear Plus pH Pineapple Banana
Metagenics Clear Change 28-Day Detox Program with UltraClear Plus pH Vanilla
Metagenics Clear Change 28-Day Detox Program with UltraClear Plus Pineapple Banana
Metagenics Clear Change 28-Day Detox Program with UltraClear Plus Vanilla
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Metagenics UltraClear RENEW Detox Powder Berry
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Metagenics UltraInflamX Plus 360° Original Spice
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Metagenics UltraMeal Advanced Protein® Dutch Chocolate
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Douglas Laboratories Uro-Pro ®