Sports Research, L-Theanine, 200 mg, 60 Softgels
One softgel contains 200 mg of Suntheanine, Taiyo's fermentation-derived, isomerically pure L-theanine ingredient, with no caffeine. The product is publicly listed as IGEN Certified for non-GMO criteria and its label states third-party testing with lot-number lookup.
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Our Verdict
Suntheanine identity and a 200 mg dose make it the strongest form-focused option, but its testing evidence is less directly accessible than the top pick's certificate and its active-dose cost is higher.
Score Breakdown
Pros & Cons
Pros
- •Uses fermentation-derived Suntheanine rather than an undisclosed generic source.
- •Provides 200 mg in one softgel, within the 100–400 mg range directly examined in a human dose-response trial.
- •Public IGEN certification verifies non-GMO criteria, and the label provides a route to lot-specific testing information.
Cons
- •The gelatin-and-beeswax softgel is not vegetarian or vegan.
- •Contains coconut and therefore carries a tree-nut allergen declaration.
Specifications
| L-Theanine Form | Suntheanine®; fermentation-derived, isomerically pure L-theanine |
| L-Theanine Per Serving | 200 mg |
| Serving Size | 1 softgel |
| Servings Per Container | 60 |
| Caffeine Per Serving | 0 mg |
| Format | Liquid softgel |
| Other Ingredients | Organic virgin coconut oil, gelatin, vegetable glycerin, purified water, organic beeswax |
| Third-Party Evidence | IGEN Certified for non-GMO criteria; label states third-party testing and lot lookup, but no current-lot report was reviewed |
Who Is This For?
Best For
- Buyers prioritizing fermentation-derived, pure L-isomer Suntheanine
- Buyers wanting a one-softgel 200 mg serving
Not For
- Vegans or vegetarians
- People avoiding coconut or beeswax
Where to Buy
Appears In
Customer Reviews
Alternatives to Consider
California Gold Nutrition, L-Theanine, Featuring AlphaWave, 200 mg, 60 Veggie Capsules
California Gold Nutrition
Each vegetarian capsule contains 200 mg of branded AlphaWave L-theanine and no caffeine. The supplier specifies AlphaWave as at least 98% L-theanine, while iHerb publishes a product-specific iTested certificate, although the located report covers a 2018 lot.
Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg
Natural Factors
The labeled serving is two vegan chewable tablets supplying 200 mg of fermentation-derived Suntheanine without caffeine. The label fully discloses 3 g of added sugar per serving, xylitol and the remaining tablet ingredients.
Nature's Bounty, L-Theanine, 90 Capsules
Nature's Bounty
Each vegetarian capsule contains 200 mg of generic-source L-theanine and no caffeine; the only listed inactive material is the hypromellose-and-water capsule. NutraBio states that finished products receive third-party verification and offers lot-specific certificates, but the label does not identify a branded ingredient or publish an L-isomer purity specification.
Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps
Doctor's Best
One vegan capsule supplies 200 mg of branded AlphaWave L-theanine with no caffeine. AlphaWave's supplier specifies at least 98% L-theanine, but no USP, NSF, Informed Sport or published Doctor's Best product-specific certificate was located.