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NutraBio L-Theanine 200 mg - 90 Capsules
NutraBio L-Theanine 200 mg - 90 Capsules
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Regular price
$23.95 USD
Regular price
Sale price
$23.95 USD
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The full picture
Everything Vyvata knows about this product — the score, the evidence, the FAQ, and where else to find shopper reviews. No hidden data. Every vendor is scored on the same published rubric — no brand can pay for placement. Read the rubric →
74/100
Verified
Six-dimension breakdown
Evidence
78
Formulation
82
Manufacturing
82
Safety
88
Transparency
88
Sustainability
55
Why this scored 74/100
NutraBio L-Theanine 200 mg is a single-ingredient L-theanine capsule. L-theanine is a free-form amino acid from green tea with a well-supported RCT base for stress reduction, cognitive performance under stress, sleep-onset quality, and — most reliably — pairing with caffeine to blunt the jittery/anxious component while preserving alertness. Effect sizes are modest but consistent: EEG studies show alpha-wave increases within 30-60 minutes, subjective calm reports without sedation, and stress-response blunting in acute-stressor tasks. The classic caffeine-plus-theanine 1:2 ratio (100 mg caffeine + 200 mg theanine) has replicated well as a cognitive-enhancement stack. NutraBio's execution is single-ingredient, appropriately dosed at the well-tested 200 mg level, transparent-label, third-party tested. Very clean safety profile — L-theanine is essentially non-toxic at usable doses. Solid Verified-tier product; the ingredient's evidence base is real and the execution is best-in-class.
Last scored: Full rubric →
Evidence & sources
The Vyvata score's Evidence dimension measures the quality of published RCT support for a product's active ingredients at the label dose. Our source hierarchy: double-blind RCTs in MEDLINE-indexed journals > single-blind RCTs > open-label trials > observational studies > mechanism papers > N=1 case studies (anecdotes). Predatory journals and manufacturer-authored studies without independent replication are weighted down.
Product-specific evidence citations for this item are embedded in the analysis text on the "Analysis" tab. For the full framework and evidence hierarchy, see the methodology page.
How to read the Evidence dimension
- 80–100: Multiple double-blind RCTs in indexed journals directly testing this product OR the exact ingredients at the exact dose.
- 60–79: Single double-blind RCT + supporting ingredient literature at the studied dose.
- 40–59: Open-label trials + ingredient literature; no product-specific double-blind evidence.
- 20–39: Ingredient literature only; no product-specific trials or trials in predatory venues.
- 0–19: No credible evidence base or unverifiable claims.
FAQ data has not been generated for this product yet. See the site FAQ for general questions.
Customer reviews
Reviews on other platforms
The Vyvata score measures product integrity against a published rubric, not customer sentiment. Vyvata does not aggregate, republish, or license third-party reviews — the links below open search pages on their respective platforms.
All the data we have on this product
Every VSF-related metafield surfaced verbatim. Nothing hidden. If you spot data that looks wrong, let us know.
- VSF score
- 74 / 100
- Tier
- Verified
- Category
- Supplements
- Subcategory
- stress mood mental
- Last scored
- Third-party certifications
- None on record at time of scoring
- Vendor
- Ultimate Sport Nutrition
- Product type
- Health & Wellness
- Tags
- Shopify Collective, Ultimate Sport Nutrition
Every score is set from the published rubric, audit-logged, and rescored whenever new evidence emerges (published trials, updated labels, third-party testing releases). Every vendor is scored on the same criteria — no pay-to-play. See our editorial-independence disclosure for the full policy, including brands with an editorial relationship to this site.
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