L-Theanine

Single-ingredient L-theanine reference formula at 200 mg per serving, developed as a capsule, with a powder option at a 500 mg serving.

L-Theanine is a reference formula for brands building a single-ingredient amino acid product at a default amount of 200 mg of L-theanine per serving. L-theanine is the only active ingredient, so the development work centers on the raw material grade and purity, a free-flowing powder in a light capsule fill, and the taste of the same material in a drink mix.

Capsule is the lead format because 200 mg of powder fits one standard capsule with room for a flow agent, and a powder version at 500 mg serves brands that sell a stick pack. Options of 100 and 250 mg sit beside the default, and the amount is a decision for the brand and its market review.

Ingredient Composition

IngredientPer ServingRaw Material FormAlternative Form (same amount of active)
L-Theanine200 mg (default amount)L-theanine, high-purity crystalline powder of fermentation or synthetic origin; specification 200 mg L-theanine per servingA different purity or origin grade of the same compound, with the input recalculated to 200 mg of L-theanine

Amounts are stated as mg of L-theanine (C7H14N2O3, 174.20 g/mol; PubChem CID 439378). L-theanine is a single compound, so no salt conversion applies, and the input equals the labeled amount at the assay of the raw material. Purity, origin and the L-form content are set in the specification with the supplier.

Intended Benefits & Formula Rationale

This formula is designed for products positioned around calm and sleep nutrition. L-theanine is included as the single active so that the grade, the amount and the excipient system can be set without interaction with other actives.

Intended Benefit DirectionKey IngredientsFormulation Rationale
Stress and sleep nutritionL-TheanineA randomized, placebo-controlled crossover trial in 30 healthy adults gave 200 mg per day for four weeks and reported lower trait anxiety, depression and sleep disturbance scores than placebo [2]. Evidence: Referenced
Cognition and mood researchL-TheanineA systematic review and meta-analysis of 50 randomized trials in healthy participants found small-to-moderate differences favoring theanine plus caffeine over placebo in the first two hours, with some confidence intervals that include no difference [1]. Evidence: Mixed

The amount is one stated tier. The trial in [2] is small, and the review in [1] pools varied designs, so amount, claims and target market are brand decisions reviewed for each sales market.

Available Formats

The L-theanine reference formula is built for a capsule version and a powder version; counts per serving are design choices that the brand can adjust.

FormatUnitPer ServingPack SizeOther Ingredients (typical)Suitability
Capsule1 capsule200 mg60 or 120 capsulesCellulose, hypromellose shell, magnesium stearateLead format; light fill of a free-flowing powder
Powder1 stick pack500 mg30 stick packsDiluent, citric acid, sweetener, flavorDrink mix; near-neutral taste suits a light flavor

Raw Material Input & Fill (Design Estimate)

Design estimates. The input is the labeled amount divided by the assumed assay of the raw material, taken at 100% L-theanine, so 200 mg needs 200 mg of raw material per capsule and 500 mg per stick.

FormatRaw Material Input per UnitDesign FillBalance for ExcipientsVerification Before Scale-Up
Capsule200 mg280 mg per capsule80 mgFill weight variation, flow, content assay of L-theanine
Powder500 mg3000 mg per stick2500 mgDissolution, taste, caking, content assay of L-theanine

Tablet, gummy and liquid versions are separate projects, because a free amino acid derivative needs its own compression, matrix or stability work in those systems.

Formulation Considerations

Light fill and flow. At 200 mg in a 280 mg fill the active is most of the capsule, and a crystalline powder flows well but can vary in bulk density between lots. Density and flow of the received lot are checked before fill weights are fixed.
Origin and purity. L-theanine is made by fermentation or by synthesis, and the specification names the origin, the purity and the content of the L-form. Certificates are checked lot by lot.
Powder taste. L-theanine has a mild savory-sweet profile that most flavor systems cover. Dissolution and any caking in the stick pack are tested before the pack is fixed.
Amount tier and evidence. The trial in [2] used 200 mg per day for four weeks in a small sample, and the review in [1] covers varied doses, with theanine plus caffeine the most studied combination. The amount tier is a market decision, and the dose limit for each sales market is reviewed before a product is developed.

Customization Options

Brands adjust the amount per serving, the raw material origin, the format and the add-ons.

ParameterRangeNote
Amount per serving100, 200, 250 or 500 mgOptions for the brand; capsule count or stick size changes with the tier
Raw material originFermentation or syntheticChanges the impurity profile and the certificate review
FormatCapsule or powderTablet, gummy and liquid are separate projects
Pack size30 to 120 unitsSet by the brand
Add-onsMagnesium, GABA, melatoninMagnesium or GABA adds fill weight and a second content assay

The pilot run confirms flow and fill weight of the crystal grade, dissolution and caking in the stick pack, and the content assay of L-theanine in the first units against the labeled amount.

Flavor Options

FormatSuggested FlavorsWhy
PowderPeach, lemon, unflavoredA near-neutral base suits a light flavor or none

Technical Status & Data Sources

ItemStatusDetails
Reference formulaNIH DSLDThe ingredient and amount come from a labeled product in the NIH DSLD (200 mg on the label of CF000822; example DSLD labels 6137, 6138, 23755). The label names the ingredient as L-theanine; high-purity L-theanine is set as the form.
SpecificationSet in formulationL-theanine, 200 mg per serving; purity, origin, L-form content and impurity limits and method are fixed with the supplier. Unit size, fill weight and stability are set in formulation.
Data sourceNIH DSLDDSLD v9.4.0, downloaded 2026-01-10: 50,824 reference formulas merged from on-market labels with complete ingredient amounts. Counts show how labels are distributed.
Market reviewPer marketDose limits, labeling and claims are reviewed for each sales market before a finished product is developed.
ReferencesSources[1] Payne ER, Aceves-Martins M, Dubost J, et al. Effects of Tea (Camellia sinensis) or its Bioactive Compounds l-Theanine or l-Theanine plus Caffeine on Cognition, Sleep, and Mood in Healthy Participants: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Nutr Rev. 2025;83(10):1873-1891. DOI · PubMed<br>[2] Hidese S, Ogawa S, Ota M, et al. Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial. Nutrients. 2019;11(10):2362. DOI · PubMed

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