L-tryptophan reference formula at a default of 500 mg per serving, developed as a capsule, powder or tablet.
L-Tryptophan is a reference formula for brands building a single-ingredient essential amino acid product around 500 mg per serving. The brand sets the final amount for its market, and reference labels span 100 to 2,000 mg per serving.
Capsule is the lead format because most reference labels use it, with powder and tablet developed alongside. The work centers on a crystalline amino acid with limited water solubility and a bitter taste, where purity of the raw material, light protection and dose per unit decide the formula.
| Ingredient | Per Serving | Raw Material Form | Alternative Form (same amount of active) |
|---|---|---|---|
| L-Tryptophan | 500 mg | L-tryptophan free-form powder, fermentation-derived, specified on a declared-weight basis; 500 mg per serving | A different purity grade, with the impurity limits stated on the specification |
The amount is stated as mg of L-tryptophan. L-tryptophan is C11H12N2O2, 204.22 g/mol (PubChem CID 6305); the free form has no salt or hydrate conversion.
This formula is designed for products positioned around evening and sleep nutrition. L-tryptophan is included as the single ingredient so that the concept stays on one essential amino acid.
| Intended Benefit Direction | Key Ingredients | Formulation Rationale |
|---|---|---|
| Sleep continuity | L-Tryptophan | A systematic review and meta-analysis of tryptophan supplementation reports that supplementation shortened wake after sleep onset (SMD −1.08; 95% CI −1.89 to −0.28), with a shorter wake after sleep onset at 1 g or more per day than at less than 1 g [1]. Evidence: Referenced |
| Other sleep components | L-Tryptophan | The same review reports that tryptophan supplementation did not affect other sleep components, and its meta-analysis of the effect on wake after sleep onset rests on four articles [1]. Evidence: Mixed |
The amount is a design choice. The review in [1] covers several doses and does not test this formula, so any claim on a finished product is reviewed for each market.
Reference labels are mostly capsules, with powders and tablets behind them; these three formats are developed here.
| Format | Unit | Per Serving | Pack Size | Other Ingredients (typical) | Suitability |
|---|---|---|---|---|---|
| Capsule | 1 capsule | L-tryptophan 500 mg | 60 or 90 capsules | Gelatin or vegetable capsule shell, magnesium stearate, rice flour | Lead format; one capsule per serving |
| Powder | 1 stick pack, 3 g | L-tryptophan 500 mg | 30 stick packs | Sweetener, acid, flavor, flow agent | Dissolves into a drink; needs taste work |
| Tablet | 1 tablet | L-tryptophan 500 mg | 60 tablets | Microcrystalline cellulose, silica, magnesium stearate, coating | Compressed unit; coating covers the bitterness |
Design estimates. L-tryptophan is assumed at 100% of its declared weight, so 500 mg per serving needs 500 mg of raw material; the supplier’s assay is applied once the lot is chosen.
| Format | Raw Material Input per Unit | Design Fill | Balance for Excipients | Verification Before Scale-Up |
|---|---|---|---|---|
| Capsule | 500 mg | 540 mg per capsule | 40 mg | Fill weight against the capsule volume, weight spread, shell opening time |
| Powder | 500 mg | 3 g per stick pack | 2,500 mg | Dispersion in water, settling, bitterness in the finished drink |
| Tablet | 500 mg | 650 mg tablet weight | 150 mg | Compression, hardness, coating, disintegration |
Liquid and gummy are separate projects, because the limited solubility of tryptophan in water changes the formulation work in those systems.
Brands adjust the amount, the format and the add-ons.
| Parameter | Range | Note |
|---|---|---|
| L-tryptophan per serving | 500, 1000 or 1500 mg | Examples for the brand; unit count or scoop size rises with the amount |
| Format | Capsule, powder or tablet | Liquid and gummy are separate projects |
| Add-ons | Magnesium, vitamin B6, melatonin | A second ingredient changes the unit weight, the claim wording and the market review |
| Pack | Bottle with desiccant or blister | Protects the amino acid from light and humidity |
The pilot run confirms capsule fill against the volume at the chosen lot, tablet coating performance, and the dispersion of the powder in water.
| Format | Suggested Flavors | Why |
|---|---|---|
| Powder | Berry, lemon, tropical | Strong fruit flavors cover the bitterness |
| Item | Status | Details |
|---|---|---|
| Reference formula | NIH DSLD | The ingredient and amount come from a labeled product in the NIH DSLD (500 mg on the label of CF001801; example DSLD labels 11367, 25209, 42041). The label names the ingredient as L-tryptophan; the free form is set. |
| Specification | Set in formulation | L-tryptophan free amino acid at 500 mg per serving; assay, specific rotation, impurity profile, moisture, microbial and heavy-metal limits and method are fixed with the supplier. Unit size, fill weight and stability are set in formulation. |
| Data source | NIH DSLD | DSLD 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 review | Per market | Dose limits, labeling and claims are reviewed for each sales market before a finished product is developed. |
| References | Sources | [1] Sutanto CN, Loh WW, Kim JE. The impact of tryptophan supplementation on sleep quality: a systematic review, meta-analysis, and meta-regression. Nutr Rev. 2022;80(2):306-316. DOI · PubMed |
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