L-Carnosine

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

L-Carnosine is a reference formula for brands building a single-ingredient dipeptide product at a default amount of 500 mg of L-carnosine per serving. L-carnosine, the dipeptide of beta-alanine and histidine, is the only active, so the development work centers on the purity and stability of a synthetic dipeptide and on the capsule or powder system that carries it.

Capsule is the lead format because 500 mg fits one standard capsule, with a powder version for brands that sell a stick pack or a drink mix. The reference labels range from 200 mg to 1,500 mg per serving, so the amount is a brand decision set around the default.

Ingredient Composition

IngredientPer ServingRaw Material FormAlternative Form (same amount of active)
L-Carnosine500 mg (default amount)L-carnosine (beta-alanyl-L-histidine, C9H14N4O3, 226.23 g/mol PubChem); specification 500 mg per serving, purity and related-dipeptide limits set with the supplierA zinc-carnosine complex, which is a different ingredient with its own zinc content and specification

Amounts are stated as mg of free L-carnosine. It is not a salt or hydrate, so no conversion applies, and the assay and the limits for beta-alanine and histidine are part of the specification.

Intended Benefits & Formula Rationale

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

Intended Benefit DirectionKey IngredientsFormulation Rationale
Cognitive aging nutritionL-CarnosineA systematic review and meta-analysis found no significant differences in most cognitive measures between L-carnosine and placebo in five randomized trials, and concluded that low-strength evidence suggests L-carnosine combined with anserine or antioxidants may slow cognitive decline in older adults [1]. Evidence: Mixed
Physical endurance nutritionL-CarnosineA placebo-controlled randomized trial of carnosine at 2 g per day for about 12 weeks reported improved muscular and cardiorespiratory endurance in select age groups and in males, without a change in grip strength [2]. Evidence: Mixed

The amounts in [1] and [2] were set by each study, and [2] used 2 g per day, so amount, claims and target market for a finished product are brand decisions reviewed for each sales market.

Available Formats

The L-carnosine 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 capsule500 mg60 or 120 capsulesMicrocrystalline cellulose diluent, anti-caking flow agent, plant-based capsule shellLead format; dipeptide powder in a standard fill
Powder1 stick pack500 mg30 stick packsDiluent, sweetener, flavorDrink mix; the amount is small against the base

Raw Material Input & Fill (Design Estimate)

Design estimates. The input is the labeled L-carnosine weight at an assumed 100% assay of the powder as purchased, so 500 mg of L-carnosine per unit is used as the input; the real input follows the certificate of analysis.

FormatRaw Material Input per UnitDesign FillBalance for ExcipientsVerification Before Scale-Up
Capsule500 mg L-carnosine560 mg per capsule60 mgPowder density, fill weight variation, flow, assay
Powder500 mg L-carnosine2500 mg per stick2000 mgDispersion, taste, moisture pickup, assay

Tablet, softgel and liquid versions are separate projects, because a dipeptide in solution or oil needs its own stability work.

Formulation Considerations

Dipeptide stability. L-carnosine is a dipeptide that can break down into beta-alanine and histidine in moisture and heat. The specification limits those components, and humidity control and packaging with desiccant are set early.
Purity and source. L-carnosine is made by synthesis, so the specification names the grade, the assay and the limits for related substances, and the supplier is qualified before development.
Bitter and metallic note. The dipeptide has a slightly bitter note in water. In powders the sweetener and flavor system is built around it, and capsules cover the taste.
Evidence and tier. The review in [1] covers trials with different carnosine amounts and combinations, and the trial in [2] used 2 g per day. Dose limits and label wording are set for each sales market before development starts.

Customization Options

Brands adjust the L-carnosine amount, the format and the add-ons.

ParameterRangeNote
L-carnosine per serving200, 500, 1000 or 1500 mgExamples for the brand; unit count or stick size follows the amount
FormatCapsule or powderTablet, softgel and liquid are separate projects
Pack size30 to 120 unitsSet by the brand
Add-onsAlpha-lipoic acid, zincEach add-on raises the fill weight, and zinc may form a complex with the dipeptide

The pilot run confirms powder density and fill weight, dipeptide stability on storage, and the assay of the first units against the specification.

Flavor Options

FormatSuggested FlavorsWhy
PowderLemon, pineapple, berryFruit profiles cover the slight bitterness of the dipeptide

Technical Status & Data Sources

ItemStatusDetails
Reference formulaNIH DSLDThe ingredient and amount come from a labeled product in the NIH DSLD (500 mg on the label of CF000309; example DSLD labels 2098, 15630, 25476). The label names the ingredient as l-carnosine; the free dipeptide is set as the form.
SpecificationSet in formulationL-carnosine, 500 mg per serving; assay, related-substance limits, heavy-metal 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] Hsiao YF, Fan Z, Fan YY, Chung M. The effects of carnosine on cognitive function and mental health: a systematic review and meta-analysis. Nutrients. 2026;18(9):1385. DOI · PubMed<br>[2] O’Toole TE, Wingard CJ, Bariess SK, et al. Effects of carnosine supplementation on physical endurance: a placebo-controlled randomized clinical trial. J Int Soc Sports Nutr. 2026;23(1):2679716. DOI · PubMed

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