Nutricost, L-Theanine, Unflavored, 3.6 oz (100 g)
Each 0.2 g scoop contains 200 mg of generic L-theanine, and the label lists no other ingredients. It is by far the lowest-cost option per active milligram, although the page supplies only a general third-party-tested claim rather than a named certification or published COA.
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Our Verdict
Exceptional value, a 200 mg serving, and a one-ingredient label earn fourth place. It remains below the branded products because neither L-isomer process documentation nor a product-specific laboratory report is published on the iHerb page.
Score Breakdown
Pros & Cons
Pros
- •200 mg serving with no other ingredients
- •Approximately $0.03 per serving and 500 servings per container
- •Vegetarian, gluten-free, non-GMO, and caffeine-free labeling
Cons
- •Generic L-theanine without a disclosed branded L-isomer process
- •Measuring a 0.2 g scoop can be less repeatable than using a premeasured capsule
Specifications
| L-Theanine Per Serving | 200 mg |
| L-Theanine Form | Generic L-theanine powder; branded purity process not disclosed |
| Serving Size | 1 scoop (0.2 g) |
| Servings Per Container | 500 |
| Caffeine | 0 mg; none listed |
| Format / Vegan | Loose unflavored powder; labeled vegetarian |
| Other Ingredients | None |
| Testing / Certification | Label states third-party tested and GMP compliant; no named certification or published product-specific COA linked |
Who Is This For?
Best For
- High-volume buyers prioritizing cost per active milligram
- Buyers wanting a filler-free powder with adjustable portions
Not For
- Buyers prioritizing Suntheanine or AlphaWave
- People who prefer premeasured capsules
Where to Buy
Appears In
Customer Reviews
Alternatives to Consider
California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules
California Gold Nutrition
Each vegan capsule supplies 100 mg of branded AlphaWave L-theanine without caffeine. A published iTested report identifies the product codes, laboratories, potency result, and microbial results, although it covers lot 3533 from 2018 rather than current inventory.
Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets
Natural Factors
The label defines one serving as two chewable tablets, providing 200 mg of enzymatically produced Suntheanine. The product is vegan and carries Isura non-GMO documentation and mass-spectrometry laboratory verification, but each serving also contains 3 g of added sugar.
Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps
Doctor's Best
One vegan capsule supplies 200 mg of AlphaWave L-theanine with no caffeine. The label fully discloses the active dose and excipients, but the iHerb page does not link a recognized finished-product certification or product-specific certificate of analysis.
EVLution Nutrition, L-Theanine, 200 mg, 60 Veggie Capsules
EVLution Nutrition
Each vegan capsule supplies 200 mg of generic L-theanine without caffeine. It provides strong active-ingredient value and a trial-aligned dose, but the label does not identify a branded purity process, recognized certification, or product-specific COA.