Sports Research L-Theanine Review

Sports Research L-Theanine is a high-quality supplement featuring Suntheanine®, a patented and pure form of L-Theanine, designed to support a state of relaxation without drowsiness.

Product Focus: Stress and CalmAlso graded for:Adrenal SupportEnergyAlso covers:Brain

Tier ⓘ

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Members see this product's tier and why. Tiers run from 1, the strongest evidence, to 5. How we grade →

Evidence ⓘ

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How strongly the evidence says this product works: human studies count most, then real reviews, then our biohacker panel.

Positive Reviews

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Biohacker Mentions

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Cost per month

$10

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Study, Trial or Testing Result SummaryMembersHuman studies

This product gives 200 milligrams of L-theanine a day, a dose that matches what studies used. The evidence is . …

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Review Totals and SummaryMembers16,898 reviews

16,898 reviews · Amazon 14,734 · IHerb 1,718 · Walmart 441 · Target 5

Sports Research L-Theanine has amassed a substantial number of reviews across platforms like Amazon, iHerb, and Walmart, with a leaning . From the bulk of recent Amazon and iHerb user feedback, it's that people find this supplement particularly for feelings of anxiety and stress. …

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Biohacker SummaryMembersWhat our biohacker panel says

ten panelists spoke about L-theanine, the main ingredient: six it and four say they use it, and one reported stopping or gave a . The common reason is sleep, with taking 200 mg before bed, while a take 100 mg or 300 mg. …

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RAL SummaryMembersThe tier and why

Rated because the larger analyses found anxiety over placebo and only a stress that depended on studies. A trial in people with an anxiety disorder also showed .

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More DetailsMembersBody systems · Combine with · Possible side effects

Body systems: Nervous system. Combine with and possible side are for members.

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Supplement FactsL-Theanine 200 mg

Supplement Facts

Serving Size 1 Softgel

Servings Per Container 150

Amount Per Serving% Daily Value

L-Theanine (as Suntheanine®)

200 mg

†

† Daily Value not established.

Directions: 1 softgel a day

Barcode (UPC) 023249093480 · Label source: the brand's label · Report a label change

Where to BuySports Research · iHerb · Walmart

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Graded October 23, 2026 by the Reverse Age Lab evidence engine, from human studies, real reviews and our biohacker panel. How we grade. Is this medical advice? No. Rala organizes the published evidence; go over any change with your doctor, especially if you take meds.