Senna Powder

Senna powder reference formula with an example 500 mg per serving, developed as a capsule or a powder, with the final amount set by the brand.

Senna Powder is a reference formula for brands building a single-ingredient senna product, with the leaf powder declared by weight. The example serving carries 500 mg of senna in one capsule, and the brand sets the final amount, the sennoside specification and the format for its market, after the regulatory position of senna has been reviewed.

A capsule is the lead format because 11 of the 32 reference labels are capsules, with powders, teas and other formats as the remainder. The development work centers on the sennoside content that the powder is specified to carry, the fine-powder handling of a leaf material, and above all the market status of a stimulant laxative botanical.

Ingredient Composition

IngredientPer ServingRaw Material FormAlternative Form (same amount of active)
Senna Powder500 mg (example amount)Senna (Senna alexandrina) leaf powder; specification 500 mg powder per serving, with sennoside content, particle size and heavy metal limits set with the supplierA standardized senna extract at an adjusted weight

The amount is the weight of the powder as declared on the label, so the sennoside content is part of the specification and is not inferred from the weight. The label names the ingredient as senna; whether it is leaf powder, pod or extract is set in the specification.

Intended Benefits & Formula Rationale

This formula is designed for products positioned around digestive regularity and traditional botanical use. Senna powder is included as the single active so that the sennoside content, the particle size and the format can be set around one ingredient.

Intended Benefit DirectionKey IngredientsFormulation Rationale
Traditional botanical for regularitySenna PowderIncluded as a leaf powder from a plant used in stimulant laxative products. Evidence: Product positioning
ConstipationSenna PowderA review states that stimulant laxatives are established first- or second-line treatments for constipation with a reliable therapeutic effect, notes that safety concerns exist particularly with long-term use, and finds no convincing evidence that stimulant laxatives are associated with colon cancer; the review concerns stimulant laxatives as a class [1]. Evidence: Referenced

The example amount is a starting point, and the brand sets the final amount and the format for its market.

Available Formats

The 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 mg senna powder60 or 90 capsulesCapsule shell, flow agentLead format; one capsule per serving
Powder1 stick pack500 mg senna powder30 stick packsCarrier, natural flavorPowder for stirring into drinks

Raw Material Input & Fill (Design Estimate)

Design estimates. The powder is assumed at 100% of the declared weight and a bulk density of 0.4 g/mL, so a size 00 capsule holds about 450 mg and a serving of 500 mg needs a size 00 capsule at full fill.

FormatRaw Material Input per UnitDesign FillBalance for ExcipientsVerification Before Scale-Up
Capsule500 mg powder per capsuleAbout 510 mg in a size 00 capsuleAbout 10 mg flow agentBulk density and flow, fill weight variation, sennoside assay, moisture
Powder500 mg powder per stick2 g stick packAbout 1.5 g carrier and flavorBlend uniformity, moisture, taste, dissolution, sennoside assay

Tablet, tea and liquid versions are separate projects, because a leaf powder needs its own compression or infusion study in those formats.

Formulation Considerations

Market status. Senna and sennosides are stimulant laxative ingredients, and many markets treat them as medicines or restrict them as food supplement ingredients and set dose and labeling rules. The sales markets are chosen first, and the market review is completed before a product is developed.
Sennoside content. The activity of senna is described by its sennoside content. The specification names the assay and the method, and the serving is set from the assay so that the stated amount is the same from batch to batch.
Fine powder handling. A leaf powder is light, dusty and takes up water. Flow, dust control and a desiccant in the bottle are checked in the pilot run.
Evidence and claims. The cited review addresses stimulant laxatives as a class and not a senna powder supplement [1], so claims on a finished product are reviewed for each sales market before a product is developed.

Customization Options

Brands adjust the senna amount, the sennoside specification and the format.

ParameterRangeNote
Senna per serving12.5 to 1900 mg across the reference labelsThe sennoside assay and the market limits decide the amount
Sennoside specificationSet with the supplierSets the strength and the market fit
FormatCapsule or powderTablet, tea and liquid are separate projects
Add-onsFennel, gingerEach add-on changes the fill weight and the label

The pilot run confirms the capsule fill weight and flow, the moisture of the powder and the sennoside assay of the first fills.

Flavor Options

FormatSuggested FlavorsWhy
PowderUnflavored, mintMint notes cover the earthy taste

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 CF042005; example DSLD label 308746). The label names the ingredient as senna.
SpecificationSet in formulationSenna leaf powder, 500 mg per serving; sennoside content and method, particle size, loss on drying, heavy metal and microbial limits and methods 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] Whorwell P, Lange R, Scarpignato C. Review article: do stimulant laxatives damage the gut? A critical analysis of current knowledge. Ther Adv Gastroenterol. 2024;17:17562848241249664. DOI · PubMed

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