Amino Acids

L-Theanine

γ-Glutamylethylamide

L-Theanine: ingredient identity and Supplement Facts declaration reference. Daily Value not established.

FDA Reference Data

RDI (Adults 4+)

Not established

Unit

Supplement Facts Declaration

Depends on ingredient and amount

Regulation

21 CFR 101.36

Supplement Facts: declaration depends on the ingredient and amount per serving (21 CFR 101.36). For (b)(2) nutrients, confirmed absent or zero-declarable amounts must be omitted. Missing data is unknown, not zero. Nutrition Facts food-label rules are separate.

† Daily Value not established — Per FDA 21 CFR 101.36(b)(2)(iii), this symbol must appear on the Supplement Facts label.

Sample Supplement Facts for L-Theanine

Supplement Facts

Serving Size 1 capsule

Servings Per Container 30

Amount Per Serving% Daily Value

L-Theanine200 mg †

L-Theanine (free form)—

* The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet.

† Daily Value not established.

Illustrative sample — format generated by ReguSift per 21 CFR 101.36.

Review a Supplement Facts draft with L-Theanine.

Upload a specification or COA containing declared amounts per serving. AI extracts available values; compare the amount, unit and source form with your document before confirming. This illustrative panel is not evidence of a suitable dose or a compliant finished package.

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About L-Theanine

Confirm the exact identity of L-Theanine (γ-Glutamylethylamide), its source and amount per serving. Dietary ingredients without an established Daily Value can still belong in Supplement Facts under 21 CFR 101.36(b)(3), with the applicable amount and Daily Value not established footnote. Review botanical plant-part information where applicable. This reference does not establish the ingredient’s permissibility, safety, effectiveness or a recommended dose.

Common Supplement Forms

L-Theanine (free form)

Identity example. Verify the exact form and amount basis against your supplier specification; do not infer effectiveness, dose or conversion from the form name.

Suntheanine®

Identity example. Verify the exact form and amount basis against your supplier specification; do not infer effectiveness, dose or conversion from the form name.

Reference sources and scope

Adult/children 4+ reference values: 21 CFR 101.9(c). Supplement declaration conditions: 21 CFR 101.36(b). Ingredient identity and botanical naming: 21 CFR 101.4. Reference links checked 20 October 2026.

Form names are identity examples. They do not establish product amounts, ingredient permissibility, health effects or a recommended dose. Confirm your exact specification and intended population.

Frequently Asked Questions

What source amount should I use for L-Theanine?

Use your product’s confirmed declared amount per serving, with units and a clear source basis. A raw-material weight is not automatically the finished-product declared amount. Request missing values from the source owner.

Does L-Theanine have an established Daily Value?

No FDA Daily Value is established for this reference entry. The lack of a Daily Value does not make a dietary ingredient an excipient. Check the applicable amount declaration and † footnote requirements.

How should missing L-Theanine data be handled?

Keep the missing amount unresolved and ask the source owner. Do not insert a typical dose or infer a product amount from the reference page.

How do I check the form of L-Theanine?

Compare the exact form in the manufacturer’s specification with the source identity and serving declaration. Forms listed here are identity examples, not recommendations or a guarantee of interchangeability. Check any botanical naming and plant-part requirements and the applicable blend rules.