--- title: "L-Theanine vs Glycine: Side-by-Side Comparison (2026)" description: "Compare L-Theanine vs Glycine — mechanism, half-life, dose range, side effects, and live vendor pricing. Side-by-side data from BodyHackGuide — we earn a" lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.bodyhackguide.co/" }, { "@type": "ListItem", "position": 2, "name": "Compare", "item": "https://www.bodyhackguide.co/compare" }, { "@type": "ListItem", "position": 3, "name": "L-Theanine vs Glycine" } ] }, { "@context": "https://schema.org", "@type": "WebPage", "name": "L-Theanine vs Glycine: Side-by-Side Comparison (2026)", "description": "Compare L-Theanine vs Glycine — mechanism, half-life, dose range, side effects, and live vendor pricing. 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Glycine is a foundational that glycine acts through multiple distinct and non-redundant mechanisms, explaining its extraordinarily broad range of biological effects. understanding these mechanisms clarifies when…. The two differ in mechanism, half-life (1-3 hours (plasma); central CNS effect 3-5 hours vs not reported), and typical dose range." } }, { "@type": "Question", "name": "Which has the longer half-life, L-Theanine or Glycine?", "acceptedAnswer": { "@type": "Answer", "text": "L-Theanine has a half-life of 1-3 hours (plasma); central CNS effect 3-5 hours. Glycine has a half-life of not reported. Longer half-lives generally mean less frequent dosing but slower on/off kinetics." } }, { "@type": "Question", "name": "Can you stack L-Theanine and Glycine?", "acceptedAnswer": { "@type": "Answer", "text": "Stacking depends on mechanism overlap, safety profile, and goals. L-Theanine and Glycine should only be stacked after reviewing each compound's individual protocol page, side effect profile, and any published interaction data. Use the BodyHackGuide stack builder for a structured review before combining research compounds." } } ] } ] --- [Skip to content](#main-content) ## Research Use Only This site is an **educational resource** for research compounds. We do **not endorse** human consumption of any compound. BodyHackGuide and **BHG Labs share common ownership**; we rank every vendor on the same public methodology, and we earn a commission on purchases through our links. By entering, you confirm you are **21 years of age or older** and agree to our [Terms](/terms) & [Privacy Policy](/privacy). I'm 21+ — Enter SiteLeave site [![BodyHackGuide](/assets/bodyhackguide-logo-DOzZNUyh.webp)BodyHackGuide ](/) [Compare](/compare)[Wiki](/wiki)[Vendors](/vendors)[Deals](/deals)[Stacks](/stack-builder)[Nootropics](/nootropics)[Tools](/tools) Learn Community Search ⌘K [Sign In](/auth?returnTo=%2Fcompare%2Fl-theanine-vs-glycine) 100K+ researchers trust BodyHackGuide — Join [r/BodyHackGuide](https://reddit.com/r/bodyhackguide) 1. [Home](/) 2. [Compare](/compare) 3. L-Theanine vs Glycine # L-Theanine vs Glycine Side-by-side comparison of L-Theanine and Glycine: mechanism, half-life, dose range, safety profile, and live vendor pricing. Updated continuously as new research and listings land. ## Live price snapshot ### L-Theanine Current low $85.00 as of Apr 7, 2026 7-day low — no 7d data yet 30-day low — no 30d data yet 30-day change — baseline building ### Glycine ## L-Theanine L-Theanine is a non-proteinogenic amino acid found almost exclusively in tea (Camellia sinensis) and a handful of edible mushrooms, and it has become the single most widely-used calm-focus nootropic in the modern… [Full L-Theanine profile](/compound/l-theanine) ## Glycine Glycine is the simplest amino acid—a single hydrogen atom replacing the typical side chain found in other proteinogenic amino acids—yet it performs an wide range of biological functions. Despite being classified as… [Full Glycine profile](/compound/glycine) ## Side-by-side comparison Attribute L-Theanine Glycine Category Nootropics Foundational Research Stage FDA Approved Preclinical Mechanism of Action L-Theanine is a weak, broad-spectrum neurotransmitter modulator that produces its "relaxed alertness" signature through small simultaneous effects on glutamate, GABA, monoamines, and cortical oscillatory activity — rather than through strong action at any… Glycine acts through multiple distinct and non-redundant mechanisms, explaining its extraordinarily broad range of biological effects. Understanding these mechanisms clarifies when supplementation is likely to produce clinically meaningful benefit versus when… Half-Life 1-3 hours (plasma); central CNS effect 3-5 hours — Typical Dose Range — — Dosing Frequency — — Administration Oral — Side Effects L-theanine has one of the cleanest safety profiles of any CNS-active nootropic, with no dependence, withdrawal, tolerance, or serious adverse events reported in controlled trials at doses up to 900mg/day for weeks to months. Common mild side effects (all… Glycine has an exceptional safety profile across extensive clinical use. Doses up to 60 g daily have been used in schizophrenia trials without systematic serious adverse effects. For typical supplementation doses (3-15 g daily), side effects are uncommon and… Molecular Weight 174.20 g/mol — Common Vial Sizes — — ## Price tracking Tracking L-Theanine prices since April 7, 2026. Trend chart unlocks once we have multiple daily snapshots — new data points land every 24 hours. ## Frequently asked ### What's the difference between L-Theanine and Glycine? L-Theanine is a nootropics that l-theanine is a weak, broad-spectrum neurotransmitter modulator that produces its "relaxed alertness" signature through small simultaneous effects on glutamate, gaba, monoamines,…. Glycine is a foundational that glycine acts through multiple distinct and non-redundant mechanisms, explaining its extraordinarily broad range of biological effects. understanding these mechanisms clarifies when…. The two differ in mechanism, half-life (1-3 hours (plasma); central CNS effect 3-5 hours vs not reported), and typical dose range. ### Which has the longer half-life, L-Theanine or Glycine? L-Theanine has a half-life of 1-3 hours (plasma); central CNS effect 3-5 hours. Glycine has a half-life of not reported. Longer half-lives generally mean less frequent dosing but slower on/off kinetics. ### Can you stack L-Theanine and Glycine? Stacking depends on mechanism overlap, safety profile, and goals. L-Theanine and Glycine should only be stacked after reviewing each compound's individual protocol page, side effect profile, and any published interaction data. Use the BodyHackGuide stack builder for a structured review before combining research compounds. ## See current vendor prices Live listings from the vendors we track, refreshed continuously. [L-Theanine prices](/compound/l-theanine?tab=prices) [Glycine prices](/compound/glycine?tab=prices) [Compare all compounds](/compare) ### Before you buy L-Theanine or Glycine Check the vendor trust score. Every supplier we track is rated 0–100 on COA verification, payment transparency, shipping, reviews, and listings — one published, reproducible methodology, applied to every vendor including BHG Labs, which shares our ownership. [View Vendor Scorecard](/vendors/scorecard) ## Related comparisons [L Theanine vs L Tyrosine](/compare/l-theanine-vs-l-tyrosine)[Melatonin vs Glycine](/compare/melatonin-vs-glycine)[Taurine vs Glycine](/compare/taurine-vs-glycine)[NAC vs Glutathione](/compare/nac-vs-glutathione)[Alpha GPC vs CDP Choline](/compare/alpha-gpc-vs-cdp-choline)[Theacrine vs Caffeine](/compare/theacrine-vs-caffeine)[Creatine vs Taurine](/compare/creatine-vs-taurine)[Magnesium vs Zinc](/compare/magnesium-vs-zinc) **Research use only.** BodyHackGuide is a research and price-comparison reference. BodyHackGuide and BHG Labs share common ownership. The compounds discussed on this page are not approved by the FDA for human consumption and are sold strictly for laboratory research. Prices shown are pulled from vendor listings tracked on BHG and are subject to change. We earn an affiliate commission on some outbound clicks, and every vendor is ranked on the same public, reproducible methodology. 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