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Product analysis · Life Extension

Life Extension L-Theanine 200mg – Capsules

L-theanine alone · Capsule

Why this score?
Testing & evidence
9/20
Ingredient/formulation quality
23/25
Value
15/20
Dose transparency
11/15
Manufacturer transparency
9/10
Label/ingredient transparency
10/10
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Testing transparency: 9/20
CapsuleFormat
Daily dose not confirmedDaily dose
60 capsulesPack size
—Price/day
No current offer in UKCompare alternatives

We may earn a commission from qualifying purchases. This never affects our scores.

The score, explained

Our scoring methodology
Testing & evidence45/100
9 points contributed · weighting 20
Ingredient/formulation quality90.7/100
23 points contributed · weighting 25
Value73/100
15 points contributed · weighting 20
Dose transparency73.6/100
11 points contributed · weighting 15
Manufacturer transparency85/100
9 points contributed · weighting 10
Label/ingredient transparency97/100
10 points contributed · weighting 10

The score compares product data, not medical effectiveness or individual suitability. Prime and affiliate commission contribute no points.

Testing & evidence

Testing claimed

Evidence status
Testing claimed
Manufacturer statement
Life Extension says: "We are happy to provide a summary of the reports we receive from the contract manufacturers and the independent laboratories that test both our raw materials and final products. We can do this for every supplement..." and the product page says: "Laboratory analysis confirms that theanine used in our formulation contains only the pure L-Theanine form of this amino acid."
Laboratory
Not recorded
Certification body
Not recorded
Batch
Not recorded
Batch-specific report
Not established in this record
Report date
Not recorded
Evidence checked
2026-09-27 16:54:32

Dose & value

Formulation
L-theanine aloneNamed ingredientCapsuleAlphaWave
Daily dose
200–400 mgWithin recommended rangeTypical: 100–400 mg/day
Serving size
2 capsules
Pack size
60 capsules
Servings per day
Not disclosed
Price per day
—
Price last checked
Not disclosed

Daily cost uses the recorded label serving; a larger dose earns no value advantage. The label serving is not a recommendation for your personal intake.

L-theanine formulation details

Comparison form
L-theanine alone
Named L-theanine ingredient
AlphaWave
Caffeine per serving (mg)
Not disclosed
Other active ingredients (summary)
Not disclosed
Standardisation / purity as labelled
Not disclosed
L-theanine per serving as labelled
200 mg per serving
Serving as labelled
2 capsules
Daily amount (mg, single direction only)
Not disclosed
Other active ingredients
None declared
Pack size as labelled
60 capsules
Recommended serving / frequency
Take two vegetarian capsules one to two times daily
Allergen statement
Not disclosed
Vegan / vegetarian label status
Not disclosed

Ingredients & suitability

Excipients
Not disclosed — check the current label
Allergens
Not disclosed
Carrier / source
Not disclosed — check the current label
Other active ingredients
None declared

Manufacturer transparency

Brand
Life Extension
Legal company
Quality Supplements and Vitamins, Inc. (d/b/a Life Extension)
Manufacturing model
Not conclusively disclosed (mixed in-house/third-party)
Manufacturing location
United States (New Jersey facility referenced)

View the full brand profile →

What the record makes clear

  • Active amount is disclosed.
  • The current record does not support a daily cost calculation.

What to keep in mind

  • Verify the current label and the batch covered by any testing report.
  • A product score cannot determine whether you need a supplement.

Explore the alternatives

Compare alternative

Ambervit L-Theanine 400 mg 180 capsules 400mg – Capsules

Why this score?
Testing & evidence
20/20
Ingredient/formulation quality
21/25
Value
15/20
Dose transparency
15/15
Manufacturer transparency
9/10
Label/ingredient transparency
9/10
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Testing evidence
Evidence status
Verified independent evidence
Manufacturer statement
Alpha01 product page for the same L-Theanine 400mg product lists 'CERTIFICATIONS & LAB TESTS' and links to batch-specific reports for 'Potency & Active Ingredient Testing', 'Heavy Metals Testing', and 'Microbial Contaminants Testing' for batch LC249531.
Laboratory
SIA "J.S. HAMILTON Baltic"; EUROFINS VITAMIN TESTING DENMARK A/S VEJEN Denmark
Certification body
Not recorded
Batch
LC249531/102028
Batch-specific report
Recorded
Report date
Not recorded
Evidence checked
2026-09-27 10:52:05
£0.11per day
£19.97per pack
View AnalysisBuy Nowon Amazon
Compare alternative

Ov OXFORD VITALITY Oxford Vitality L-Theanine & Caffeine 100mg – Capsules

Why this score?
Testing & evidence
9/20
Ingredient/formulation quality
21/25
Value
20/20
Dose transparency
15/15
Manufacturer transparency
9/10
Label/ingredient transparency
9/10
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Testing evidence
Evidence status
Testing claimed
Manufacturer statement
Amazon listing says: "Our supplements have been expertly created to the strictest GMP guidelines in our facility here in the UK, meaning we can guarantee the quality and safety of every product." Oxford Vitality product page also says "Quality Assured ✅" and the product description says the company "independently formulated" the product, but I did not find an independently verifiable third-party test/certification for this specific product.
Laboratory
Not recorded
Certification body
Not recorded
Batch
Not recorded
Batch-specific report
Not established in this record
Report date
Not recorded
Evidence checked
2026-09-27 10:48:55
£0.03per day
£10.99per pack
View AnalysisBuy Nowon Amazon
Compare alternative

Nutrination L-Theanine 400 mg capsules 400mg – Capsules

Why this score?
Testing & evidence
9/20
Ingredient/formulation quality
21/25
Value
19/20
Dose transparency
15/15
Manufacturer transparency
9/10
Label/ingredient transparency
9/10
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Testing evidence
Evidence status
Testing claimed
Manufacturer statement
Amazon listing and Nutri Nation site both claim testing/certification: Amazon title says "GMP - Certified, Lab Tested"; product imagery says "Third-party Lab Tested"; Nutri Nation site says "GMP CERTIFIED & THIRD PARTY TESTED" and "Made in the USA in NSF and ISO 17025 certified laboratories and third-party tested." I did not find an independently verifiable registry entry or product-specific COA for this exact L-Theanine product.
Laboratory
Not recorded
Certification body
Not recorded
Batch
Not recorded
Batch-specific report
Not established in this record
Report date
Not recorded
Evidence checked
2026-09-27 11:13:42
£0.07per day
£9.99per pack
View AnalysisBuy Nowon Amazon