Comparisons / Glycine vs Arginine
Compare mechanism, clinical dose, safety profile, and products containing each ingredient.
Overview
Glycine is usually chosen for Those seeking better sleep quality, while Arginine is often selected for Those seeking vasodilation/pump.
Amino acid that may improve sleep quality by lowering body temperature.
Clinical dose: 3000-5000 mg
Safety: Possible side effects include mild digestive discomfort, nausea, or headache, typically dose-related and more common when intake is escalated quickly.
Precursor to nitric oxide. May enhance blood flow (though citrulline is more effective).
Clinical dose: 3000-6000 mg
Safety: Possible side effects include mild digestive discomfort, nausea, or headache, typically dose-related and more common when intake is escalated quickly.
Glycine
Sleep benefits are legitimate at 3g dose before bed. Collagen "glycine" claims are valid since glycine is the primary amino acid in collagen. However, separate glycine supplementation for skin/joint is less proven than complete collagen peptides.
Arginine
Marketing claims around "pump" and vasodilation are generally supported - arginine does increase nitric oxide production and improve blood flow. However, the ergogenic effects are modest for anaerobic performance. The blood pressure benefits are real but most supplements under-dose (typical 1-3g vs effective 4-6g). Single-serving pre-workouts rarely contain enough for meaningful benefit.
Glycine
Arginine
Which is better for most people: Glycine or Arginine?
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Can Glycine and Arginine be stacked together?
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What is the effective dose for Glycine?
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What is the effective dose for Arginine?
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Is Glycine safer than Arginine?
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How long should I test before deciding between Glycine and Arginine?
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