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Sports Research L-Theanine 200mg with Suntheanine® bottle
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Sports Research L-Theanine 200mg with Suntheanine® Review

Sports Research L-Theanine features the patented Suntheanine® in a double-strength 200mg formula, designed to support mental focus, relaxation, and alertness without causing drowsiness.

Product Focus: SleepAlso 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 ⓘ
Members
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 Summary

MembersHuman studies

This product gives 200 milligrams of L-theanine a day, the dose that in studies. A pooled analysis of 19 randomized trials with 897 people found that L-theanine how quickly people felt they fell asleep, daytime tiredness and overall sleep quality compared with control. …

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Review Totals and Summary

Members15,181 reviews
15,181 reviews · Amazon 14,734 · Walmart 441 · Sportsresearch 6

Sports Research L-Theanine 200mg with Suntheanine® has attracted a substantial number of reviews from buyers across platforms like Amazon and Walmart, and overall, user feedback is largely favorable. reviewers highlight the product’s calming , with a number mentioning that it them manage stress, focus, or anxiety throughout the day. …

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Biohacker Summary

MembersWhat our biohacker panel says

Our biohacker panel has discussed this product yet.

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RAL Summary

MembersThe tier and why

The rules placed this at the second tier because a controlled trial of 98 boys using the same branded L-theanine measured sleep efficiency, supported by a pooled analysis of 19 trials and a 30-person adult trial at this product's 200 milligram dose. The cited trial used 400 milligram chewable tablets rather than this exact softgel, so it is described as a study of the ingredient than of the product itself.

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More Details

MembersBody systems · Combine with · Possible side effects

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

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Supplement Facts

L-Theanine 200 mg
Supplement Facts
Serving Size 1 Softgel
Servings Per Container 60
Amount Per Serving% Daily Value
L-Theanine (Suntheanine®)200 mg†
† Daily Value not established.

Directions: Adults take 1 softgel daily with or without food, or as recommended by a qualified healthcare professional.

Barcode (UPC) 023249010173 · Label source: the brand's label · Report a label change

Where to Buy

Sports Research · iHerb · Walmart
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Our articles on this subject

Graded October 24, 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.