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Head-to-head evidence comparison — which supplement is right for you?
Glycine and Tart Cherry are closely matched across evidence, studies, and safety.
Verdict
Likely helps
6 of 6 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
13 of 14 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Glycine and Tart Cherry have evidence — compare verdict strength side-by-side.
3g before bed
30-60 minutes before bed
Powder (dissolves easily, tastes sweet)
480-500mg extract or 240ml (8oz) juice twice daily
Morning and evening, Before/after exercise for recovery
Concentrated Montmorency tart cherry extract (capsules)
First few nights
Next morning
Immediate
1-2 weeks
Same day/next day
1-3 days
N/A
The effect of glycine administration on the characteristics of physiological systems in human adults: A systematic review
GeroScience (2024) · Systematic review · n=34
The nervous system demonstrated the most positive effects, including improved psychiatric symptoms from longer-term glycine administration in psychiatric populations.
Glutamatergic drugs for schizophrenia
The Cochrane database of systematic reviews (2006) · Meta analysis · n=132
NMDA receptor co-agonists glycine and D-serine showed some effects in reducing the negative symptoms of schizophrenia (n=132, SMD -0.66, CI -1.0 to -0.3, p=0.0004), but the magnitude of the effect was moderate.
Ingestion of a Whey Plus Collagen Protein Blend Increases Myofibrillar and Muscle Connective Protein Synthesis Rates
Medicine and science in sports and exercise (2025) · Rct · n=14
In addition, myofibrillar protein synthesis rates were higher in BLEND compared with PLA in both the rested (0.038 ± 0.008 and 0.031 ± 0.006%·h -1 , respectively; P < 0.05) and exercised (0.052 ± 0.011 and 0.039 ± 0.009%·h -1 , respectively; P < 0.01) leg.
Effects of dietary supplements on athletic performance in elite soccer players: a systematic review
Journal of the International Society of Sports Nutrition (2023) · Systematic review · n=1043
Nitrate-rich beetroot concentrate can attenuate performance decrease in the days following matches.
Effect of food sources of nitrate, polyphenols, L-arginine and L-citrulline on endurance exercise performance: a systematic review and meta-analysis of randomised controlled trials
Journal of the International Society of Sports Nutrition (2021) · Meta analysis
No effect on exercise performance following consumption of foods rich in L-citrulline was identified (SMD=-0.03, p=0.24).
Efficacy, acceptability, and tolerability of all available treatments for insomnia in the elderly: a systematic review and network meta-analysis
Acta psychiatrica Scandinavica (2020) · Meta analysis · n=6832
Insufficient evidence exists on which intervention is more efficacious for elderly patients with insomnia.
Based on systematic review showing nervous system benefits. Limited specific RCT data for sleep outcomes. Effects may vary significantly between individuals.
Meta-analysis showed small beneficial effect (ES = -0.44). Multiple studies but limited sample sizes. Effect appears modest and variable between individuals.
AI-estimated from published studies. Interpret as directional guidance.
Both Glycine and Tart Cherry are closely matched — the best choice depends on your specific health goals.
For improve deep sleep quality, Glycine has a higher relevance score (95 vs 80).
No known interactions between Glycine and Tart Cherry have been documented in our database. However, always consult a healthcare provider before combining supplements.