Life Extension Theanine XR™ Stress Relief, 30 Vegetarian Tablets supplement bottle
Life Extension

Theanine XR™ Stress Relief, 30 Vegetarian Tablets

What We Researched
3 active ingredients analyzed · 8 inactive ingredients decoded · 3 brand certifications checked · 3 retailers compared · Last updated: Mar 2026
83
Product Score Good
86
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Calcium [from dicalcium phosphate] 50 mg 4%
Phosphorus [from dicalcium phosphate] 40 mg 3%
L-Theanine [as AlphaWave® Theanine XR™] 400 mg **
Bioavailability Excellent

Absorption Rating

  • Calcium [from dicalcium phosphate] Good
  • Phosphorus [from dicalcium phosphate] Good
  • L-Theanine [as AlphaWave® Theanine XR™] Good
Other Ingredients Excellent

Fillers & Additives

  • Microcrystalline Cellulose
  • Hydroxypropyl Methylcellulose
  • Hydroxypropyl Cellulose
  • Stearic Acid
  • Silica
  • Vegetable Stearate
  • Croscarmellose Sodium
  • Glycerin
Efficacy Poor

Dosage Analysis

  • Calcium [from dicalcium phosphate] 50 mg Under-dosed
  • Phosphorus [from dicalcium phosphate] 40 mg Under-dosed
  • L-Theanine [as AlphaWave® Theanine XR™] 400 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Calcium [from dicalcium phosphate] 50 mg 4%
Phosphorus [from dicalcium phosphate] 40 mg 3%
L-Theanine [as AlphaWave® Theanine XR™] 400 mg **

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Hydroxypropyl Methylcellulose Safe

It is used as a coating for tablets and capsules.

Hydroxypropyl Cellulose Safe

Binds tablet ingredients and can form tablet coatings.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Vegetable Stearate Safe

Prevents ingredients from sticking to equipment.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Glycerin Safe

Retains moisture and helps dissolve ingredients in softgels and liquids.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$23$22$21$20$19 Mar 12 $21.00$21.00
iHerb
Vitacost

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Life Extension

Founded 1980 · Fort Lauderdale, Florida, USA · 352 products · lifeextension.com

Certifications

3 certifications
Consumerlab Verified Source
Fda Gmp Inspections Verified Source
Nsf Gmp Verified Source

Transparency

4 claims
Third Party Testing Claim — Verified Source
Coa Availability — Verified Source
Testing Lab Disclosure — Claimed

Violation History

2 incidents
Prop 65 Lead2018-04-13Source
Fda Warning Making drug claims for dietary supplements, suggesting they can treat, mitigate, or prevent diseases such as breast cancer and Alzheimer's.2017-02-01Source
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Frequently Asked Questions
Is Life Extension Theanine XR™ Stress Relief, 30 Vegetarian Tablets a good supplement?

Life Extension Theanine XR™ Stress Relief, 30 Vegetarian Tablets received a product quality score of 83/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 3 active ingredients All 8 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Life Extension, holds a brand trust score of 86/100 with 3 verified certifications including Consumerlab, Fda Gmp Inspections, Nsf Gmp.

What are the ingredients in Life Extension Theanine XR™ Stress Relief, 30 Vegetarian Tablets?

Life Extension Theanine XR™ Stress Relief, 30 Vegetarian Tablets contains 3 active ingredients: Calcium [from dicalcium phosphate] (50 mg), Phosphorus [from dicalcium phosphate] (40 mg), L-Theanine [as AlphaWave® Theanine XR™] (400 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Life Extension Theanine XR™ Stress Relief, 30 Vegetarian Tablets safe to take?

Life Extension Theanine XR™ Stress Relief, 30 Vegetarian Tablets has been analyzed for ingredient safety across all its components. All 8 inactive ingredients — including capsule materials, fillers, and binders — are rated safe based on regulatory data and published safety research. This is a clean formulation with no controversial additives. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Life Extension a trustworthy supplement brand?

Life Extension receives a brand trust score of 86/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1980 and headquartered in Fort Lauderdale, Florida, USA, the company offers 352 products in their lineup. They hold 3 verified certifications including Consumerlab, Fda Gmp Inspections, Nsf Gmp. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Life Extension has 2 historical regulatory incidents on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.