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evidence · mechanism · dose
Supplements/Amino Acid

Suntheanine

Pharmaceutical-grade L-theanine.

Mood & AnxietyBrain & Cognitive

Overview

Pharmaceutical-grade L-theanine.

Natural sources
    Common forms

      Mechanism of action

      Same as L-theanine; >99% purity.

      Pathways

        Effects on the body

        Organ system effects

        Evidence-based benefits

        Promotes relaxation

        Moderate evidence

        Potential side effects

        Common
        • · Well tolerated
        Rare
          Serious

            Drug interactions

            No notable interactions reported.

            Supplement interactions

            Pairs well with

            None listed.

            Avoid combining with

            No specific avoidances listed.

            Dosing & bioavailability

            Typical dose
            100–200 mg

            Where to buy

            Affiliate-style search links to reputable retailers. We don't endorse specific brands — verify third-party testing (USP, NSF, Informed Sport) before purchase.

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            Amazon
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            iHerb
            Global delivery · curated brands
            Amino Acid
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            Thorne
            Practitioner-grade · NSF tested

            Scientific evidence (8)

            RCTBiol Psychol · 2007

            Suntheanine and stress

            Kimura K, et al.

            12 healthy adults

            Key findings

            Reduced stress markers during cognitive task.

            Open study
            Systematic reviewPubMed (NLM) · 1970

            PubMed: Suntheanine — Promotes relaxation

            Live PubMed search

            Live results for "Suntheanine Promotes relaxation" across the PubMed/MEDLINE peer-reviewed index.

            Key findings

            Opens current human and preclinical literature matching Suntheanine and "Promotes relaxation". Filter by RCT, meta-analysis, or year on the results page.

            Open study
            Systematic reviewPubMed (NLM) · 1970

            PubMed: Suntheanine — randomized controlled trial

            Live PubMed search

            Live results for "Suntheanine randomized controlled trial" across the PubMed/MEDLINE peer-reviewed index.

            Key findings

            Opens current human and preclinical literature matching Suntheanine and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

            Open study
            Systematic reviewPubMed (NLM) · 1970

            PubMed: Suntheanine — meta-analysis

            Live PubMed search

            Live results for "Suntheanine meta-analysis" across the PubMed/MEDLINE peer-reviewed index.

            Key findings

            Opens current human and preclinical literature matching Suntheanine and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.

            Open study
            Systematic reviewPubMed (NLM) · 1970

            PubMed: Suntheanine — pharmacokinetics

            Live PubMed search

            Live results for "Suntheanine pharmacokinetics" across the PubMed/MEDLINE peer-reviewed index.

            Key findings

            Opens current human and preclinical literature matching Suntheanine and "pharmacokinetics". Filter by RCT, meta-analysis, or year on the results page.

            Open study
            Systematic reviewPubMed (NLM) · 1970

            PubMed: Suntheanine — safety adverse events

            Live PubMed search

            Live results for "Suntheanine safety adverse events" across the PubMed/MEDLINE peer-reviewed index.

            Key findings

            Opens current human and preclinical literature matching Suntheanine and "safety adverse events". Filter by RCT, meta-analysis, or year on the results page.

            Open study
            Systematic reviewPubMed (NLM) · 1970

            PubMed: Suntheanine — dose response

            Live PubMed search

            Live results for "Suntheanine dose response" across the PubMed/MEDLINE peer-reviewed index.

            Key findings

            Opens current human and preclinical literature matching Suntheanine and "dose response". Filter by RCT, meta-analysis, or year on the results page.

            Open study
            Systematic reviewGoogle Scholar · 1970

            Google Scholar: Suntheanine — clinical evidence

            Live Scholar search

            Cross-database citation index for Suntheanine as it relates to "clinical evidence".

            Key findings

            Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.

            Open study
            Educational use only. This profile is not medical advice. Consult a qualified healthcare professional before starting any supplement, especially if you take prescription medication or have a chronic condition.