Moringa Leaf Powder Spec for Greens Blends and Capsule SKUs

Buyer’s snapshot

• Reported crude protein in dried moringa leaf runs 22.99 to 29.36 percent on a dry basis, and iron spans roughly 7 to 28 mg per 100 g across the published literature. A single guaranteed number on a spec sheet is not defensible.
• Microbiological ceilings for the identical powder differ by four orders of magnitude depending on which standard the buyer names, from 10,000 cfu/g to 100,000,000 cfu/g total aerobic count.
• Under California’s Proposition 65, a 10 g greens serving and a three-capsule serving of the same lot face lead limits that differ by about 6.6 times. The powder does not change. The serving size does.
• Silk Route Ventures supplies bulk moringa leaf powder from a Matale facility under BRCGS and FSSC 22000 V6, at a 50 kg first-order MOQ per SKU, with a certificate of analysis on every batch.
• The spec matrix and the RFQ checklist below are the procurement-actionable sections.

Most moringa leaf powder sold into greens blends and into capsules is the same powder, bought against the same one-page spec, from the same lot. That is the problem. The two applications diverge on particle size, on colour tolerance, and, most expensively, on the heavy-metal ceiling that the finished serving size implies. A lot that is comfortably compliant inside a 500 mg capsule can put a 10 g greens scoop over a California warning threshold. This piece is the spec sheet for buyers who have to write one document that survives both uses, or who have decided to stop pretending one document can.

One powder, two specs: where a greens brief diverges from a capsule brief

Moringa leaf powder is specified twice over in practice: once as a capsule fill and once as a dispersible beverage ingredient. The capsule cares about bulk density and fill weight consistency, because a size 0 shell has a fixed volume and the powder either makes target weight or it does not. The greens blend cares about dispersion, mouthfeel, and colour hold in a clear sachet. Neither brief is wrong. Running both off one line item is.

Spec line	Greens blend and beverage	Capsule fill
Particle size	100 to 200 mesh (150 to 75 µm), for dispersion and mouthfeel	80 to 100 mesh (180 to 150 µm), for flow and fill-weight consistency
Sieve standard named	ASTM E11 or ISO 3310-1, stated on the spec	ASTM E11 or ISO 3310-1, stated on the spec
Bulk density	Secondary, affects scoop calibration	Primary, sets achievable fill weight per shell size
Colour	Tight tolerance, visible to the consumer	Loose, the shell is opaque
Moisture	8 percent maximum	8 percent maximum
Water activity	0.60 maximum	0.60 maximum
Lead ceiling implied by a 0.5 µg/day limit	About 0.05 mg/kg at a 10 g serving	About 0.33 mg/kg at a 1.5 g serving
Packaging	Opaque, high-barrier laminate	Opaque, high-barrier laminate

The mesh numbers deserve one caution. ASTM E11 and ISO 3310-1 put 100 mesh at 150 µm and 200 mesh at 75 µm, while the older Tyler Standard Screen Scale reads the same designations as 149 µm and 74 µm. The gap is trivial in the powder and awkward in a dispute, so name the standard beside the mesh number. For classification, the United States Pharmacopeia’s general chapter on Powder Fineness defines a fine powder as a median particle size of 125 to 180 µm and a very fine powder as 90 to 125 µm.

Worth knowing: the split above is trade practice, not a published standard. No pharmacopoeia or trade association specifies a mesh convention for capsule filling against beverage dispersion, which is why two suppliers can both call a powder “fine” and ship materially different products. Treat the mesh figures here as a starting position to negotiate against a sample, not as a specification you can cite to a standard.

Buyers weighing which plant part belongs in the capsule before they get to particle size should start with the leaf against seed comparison and the protein-claim landscape, which covers the identity and claim questions this post assumes are already settled.

What protein and iron ranges should a moringa spec actually state?

In 2020, the Journal of Agriculture and Food Research review “Nutritional and functional properties of Moringa oleifera” reported crude protein in dried leaf at 22.99 to 29.36 percent on a dry basis, with fat at 4.03 to 9.51 percent and ash at 8.05 to 10.38 percent. Drying-temperature work published in Livestock Research for Rural Development in 2021 recorded 29.2 percent protein at 55 °C convective drying. Across the literature the practical band runs about 20 to 29 percent, close to a 47 percent relative spread on the headline nutrient.

The spread is not noise. Leaf age at harvest, drying temperature, cultivar and soil nitrogen all move the number, and the Kjeldahl method converts total nitrogen at a factor of 6.25, which over-reads in a leaf carrying non-protein nitrogen. A supplier guaranteeing 28 percent as a floor is either testing every lot or guessing. Specify a floor you can hold, typically 22 to 24 percent, then report the actual assay per batch.

Iron is worse, and it is worth being blunt about why. Reported iron in dried moringa leaf runs from about 7 to 28 mg per 100 g, a fourfold spread. Some of that is agronomy. Some of it is dirt. Leafy crops grown close to the ground pick up soil and dust during harvest and drying, and soil iron content routinely exceeds the iron content of the leaf itself, so a small mass of unremoved soil lifts the measured figure considerably. A high iron assay on a moringa certificate of analysis is therefore ambiguous. It can mean a mineral-rich leaf. It can equally mean a dirtier powder.

Two spec lines resolve it. Require acid-insoluble ash, the long-standing marker for soil and grit, alongside the iron figure, and require the assay method on the certificate, specifically inductively coupled plasma mass spectrometry or optical emission spectrometry. An iron number without an acid-insoluble ash number beside it is not a quality signal.

There is also an honest limit on what that iron is worth. In 2017, Gallaher and Gallaher reported in The FASEB Journal a haemoglobin regeneration efficiency ratio of 0.4 for moringa iron, with dried leaves carrying 63.97 mg of phytic acid per gram, a phytate to iron molar ratio near 10.5. At only about 0.5 percent of the diet, moringa suppressed iron absorption from other foods in the same meal. A buyer writing an iron-forward front panel should know the absorption data does not support it.

Naming the microbiological standard, not just the numbers

This is where most moringa specs quietly fail. A line reading “meets microbiological limits” is close to meaningless, because the recognised standards disagree with each other by four orders of magnitude on the same material.

The American Herbal Products Association’s Recommended Microbial Limits for Botanical Ingredients, current as of June 2022, sets the comparison out directly:

Parameter	AHPA, dried unprocessed herbs	NSF/ANSI 173	USP, dried or powdered botanicals	THIE, dry raw materials
Total aerobic microbial count	10,000,000 cfu/g	10,000,000 cfu/g	100,000 cfu/g	100,000,000 cfu/g
Total yeast and mould	100,000 cfu/g	100,000 cfu/g	1,000 cfu/g	1,000,000 cfu/g each
Coliforms or Enterobacteria	10,000 cfu/g	10,000 cfu/g	1,000 cfu/g	Not assigned
E. coli	None detected in 10 g	100 cfu/g	Absent in 10 g	10,000 cfu/g
Salmonella spp.	None detected in 25 g	None detected in 10 g	Absent in 10 g	Absent in 125 g

A supplier can be simultaneously compliant and non-compliant on one lot, depending only on which document the buyer names. The AHPA ceiling for total aerobic count sits a hundred times above the pharmacopoeial figure for the same dried botanical. Note too that AHPA’s own rendering of the USP row does not match the USP chapter text, which reads 100,000 cfu/g for supplements containing raw materials of natural origin. The two are quoting different rows of the same table, ingredient against finished dosage form. Which is precisely the point: cite the standard, the edition, and the row.

The reassuring part is that the ceilings are not the hard constraint. A 12-month storage trial published in Molecules in 2025 found aerobic counts on dried moringa leaf between under 10 and 60 cfu/g, coliforms at 20 to 56 cfu/g, and E. coli, Salmonella, S. aureus and B. cereus absent across every treatment. Well-processed moringa lands three to five orders of magnitude below the limits. The spread between suppliers is the risk, not the standard.

Which heavy-metal limit actually binds a US or Australian moringa SKU?

Here is the arithmetic that decides whether one spec can serve two products. California’s Proposition 65 sets a maximum allowable dose level for lead of 0.5 micrograms per day, published by the Office of Environmental Health Hazard Assessment. That is a daily intake limit, not a concentration limit, so the finished serving size converts it into a concentration ceiling.

At a 10 g daily greens serving, 0.5 µg/day back-calculates to about 0.05 mg/kg of lead in the powder. At a three-capsule serving of 500 mg each, 1.5 g total, the same 0.5 µg/day allows about 0.33 mg/kg. The identical lot faces limits that differ by roughly 6.6 times purely because of how much of it someone swallows.

Put a real number against that. The Codex Alimentarius general standard on contaminants, CXS 193-1995, sets a maximum level for lead in leafy vegetables of 0.3 mg/kg. A lot sitting at that Codex level clears the capsule serving and misses the greens serving by about six times. Buyers who lifted a limit from a food standard and applied it to a scoop-format product have, in effect, specified nothing.

Two further traps sit in the same section. First, Codex has no maximum level for dried herbs or botanical powders at all. The 0.3 mg/kg figure is written for a fresh leafy vegetable, and moringa leaf loses roughly three quarters of its mass on drying, so applying a fresh-weight limit to a dried powder without adjustment is a category error in the supplier’s favour. Second, Australia writes that adjustment into law. Schedule 19 of the Australia New Zealand Food Standards Code sets lead in vegetables other than brassicas at 0.1 mg/kg and cadmium in leafy vegetables at 0.1 mg/kg, and clause S19-3(1)(d) states that where a food is dried, dehydrated or concentrated, the calculation is based on the food prior to drying. Schedule 19 carries no maximum level for arsenic or mercury in vegetables or botanical powders at all; those sit under Generally Expected Levels instead.

The pattern the Silk Route Ventures trade desk sees most often on moringa is not a bad supplier. It is a good specification being asked to do a second job it was never written for. A document drafted for a capsule line gets extended to a greens sachet, the metals section carries over untouched, and nobody converts the daily intake limit into a concentration at the new serving size. The fix costs nothing at the specification stage: split the document by application, record which serving size each limit was derived from, and keep the arithmetic in the file. Caught after a scoop SKU is on shelf, the same problem is a reformulation or a warning label.

For the underlying discipline on reading a metals panel, the companion piece on per-lot heavy metal and pesticide testing covers how to interpret the certificate itself.

Shelf life belongs to the packaging, not the powder

A shelf-life claim on a moringa specification without a stated packaging format is not a claim. It is a hope. The published stability data is unusually clear on this.

In 2015, Potisate and colleagues published storage work on dried Moringa oleifera leaves in the International Journal of Food Science and Technology, comparing polypropylene against a high-barrier PET/aluminium/PE laminate over six months at 15 to 35 °C. Total phenolics loss ran to 48 percent in the worst case, polypropylene at 35 °C, against 19 percent in the best case, foil laminate at 15 °C. Flavonoid half-life moved from 2.13 months to 1.47 months in polypropylene across that temperature range, and from 2.59 to 1.83 months in the barrier laminate.

Read honestly, that data cuts both ways. Barrier packaging reduces phenolic loss by roughly two and a half times, which is the argument for specifying it. It also puts flavonoid half-life under three months in every treatment tested, which sits awkwardly beside the 24-month shelf lives routinely printed on moringa packs. Both things are true. A 24-month shelf life on moisture, microbiology and sensory grounds is defensible. A 24-month claim on polyphenol content is not, and a buyer building a front panel around antioxidant content should specify a retest interval rather than assume the number holds.

Light matters as much as temperature. The 2025 Molecules trial found lightness values shifting from 40 to 60 over twelve months at 40 °C in transparent packaging, visible fading, while chilled opaque storage held close to baseline. Chlorogenic acid measured 393.26 µg/g at 4 °C in opaque packaging against roughly a threefold reduction in transparent packs at the same temperature. For a greens blend in a clear sachet, that is a product-appearance problem before it is a chemistry problem.

Water activity is the parameter that actually predicts mould, and it is the one most often left off the sheet. The US Food and Drug Administration’s inspection technical guide on water activity notes that a product held at 0.85 or below falls outside the scope of 21 CFR Parts 108, 113 and 114, and that Clostridium botulinum requires roughly 0.93 to grow. For a dried leaf powder, 0.85 is a long way from tight. Specify 0.60 maximum alongside the 8 percent moisture ceiling, because two powders at identical moisture can carry very different water activity depending on how the water is bound.

Spec snapshot: moringa leaf powder, bulk supply Species and part: Moringa oleifera leaf, identity confirmed per lot Particle size: 80 mesh capsule grade, 100 to 200 mesh beverage grade, ASTM E11 or ISO 3310-1 stated Moisture: 8 percent maximum. Water activity: 0.60 maximum Protein: 22 percent minimum, actual assay reported per batch Metals: lead ceiling derived from the buyer’s stated serving size, not a borrowed food limit Microbiology: standard, edition and row named on the specification Packaging: opaque high-barrier laminate, retest interval stated for polyphenol claims

What belongs on a moringa leaf powder RFQ

Nine lines, in the order a quality manager will read them.

1. Botanical species and plant part, Moringa oleifera leaf, with the identity method named.
2. Particle size, as a mesh number plus the sieve standard, ASTM E11 or ISO 3310-1, and the target application.
3. Bulk density, tapped and untapped, if any part of the volume is going into capsules.
4. Moisture ceiling and water activity ceiling, both stated. Not one or the other.
5. Protein floor with the assay method, and a note that the reported figure is per batch rather than a guaranteed constant.
6. Iron only alongside acid-insoluble ash, with inductively coupled plasma methodology named.
7. Microbiological limits with the standard, its edition, and whether the row cited is the ingredient row or the finished-product row.
8. Heavy metal ceilings expressed as a concentration derived from your finished serving size, with the arithmetic recorded in the specification file.
9. Packaging format and the shelf life claimed against that specific format, with a retest interval for any nutrient or polyphenol claim.

Buyers assembling a broader single-botanical programme will find the same logic applied across products in the direct sourcing spec guide for EU and Japan, and the enzyme-claim parallel in the papaya powder sourcing spec covers how a claim-led brief distorts a materials spec in much the same way.

Where SRV’s moringa supply does not fit A brand that wants a guaranteed 28 percent protein number without per-lot assay, an iron-forward front panel the absorption data does not support, or one spec document stretched across a capsule and a 10 g scoop into California. Those are compliance problems wearing a purchase order. Silk Route Ventures supplies moringa to buyers who will name the serving size, split the specification by application, and test per lot.

Frequently asked questions

What mesh should moringa leaf powder be for a greens blend?

For beverage and greens applications, 100 to 200 mesh, which is 150 to 75 µm under ASTM E11 and ISO 3310-1, gives dispersion and mouthfeel without excessive dust. Capsule grades run coarser at 80 to 100 mesh for fill-weight consistency. State the sieve standard alongside the mesh number, because the legacy Tyler scale reads 100 mesh as 149 µm.

What are the microbiological limits for moringa leaf powder?

There is no single answer, which is the point. The American Herbal Products Association’s 2022 comparison places dried unprocessed herbs at 10,000,000 cfu/g total aerobic count and 100,000 cfu/g yeast and mould, while the United States Pharmacopeia sets 100,000 and 1,000 cfu/g for dried or powdered botanicals. Name the standard and the row on the specification.

How much lead is allowed in moringa powder sold in the United States?

It depends on the serving size, not the powder. California’s Proposition 65 sets a lead limit of 0.5 micrograms per day, which converts to roughly 0.05 mg/kg at a 10 g greens serving and roughly 0.33 mg/kg at a 1.5 g capsule serving. Codex sets 0.3 mg/kg for fresh leafy vegetables, which does not translate directly to a dried powder.

Does Silk Foods Ceylon supply bulk moringa leaf powder to a buyer’s own specification?

Silk Foods Ceylon mills and supplies bulk moringa leaf powder from its Matale facility under BRCGS and FSSC 22000 V6, with USDA Organic and EU Organic available per SKU. First-order MOQ is 50 kg per SKU, samples ship by international courier at 3 to 5 business days, and production lead time is 2 to 3 weeks from purchase order to dispatch, with a certificate of analysis on every batch.

How Silk Route Ventures can help

Silk Route Ventures (SRV) supplies bulk Ayurvedic and functional botanicals, moringa among them, to wellness and nutraceutical brands in the United States, European Union and Australia. Powder is milled and shipped against the buyer’s own specification from the Silk Foods Ceylon (SFC) facility in Matale, which holds BRCGS and FSSC 22000 V6, with USDA Organic and EU Organic on the relevant SKUs and a certificate of analysis on every batch. Bulk MOQ is 50 kg per SKU on a first order, samples move by international courier at 3 to 5 business days, and the trade desk will write the spec by application rather than issue one document for two products. For brands taking the same botanical into a finished capsule, the SFC encapsulation line runs a 180-bottle first-order MOQ. Contact us to send an inquiry or request a sample.

Sources

1. American Herbal Products Association, Recommended Microbial Limits for Botanical Ingredients (© AHPA 2022, current as of June 2022). Retrieved 8 September 2026. https://www.ahpa.org/Files/Document%20Library/AHPAGuidancePolicies/AHPA_micro_limits_comparisons.pdf
2. United States Pharmacopeial Convention, Microbiological Attributes of Nonsterile Nutritional and Dietary Supplements, USP 35–NF 30. Retrieved 8 September 2026. https://www.drugfuture.com/Pharmacopoeia/usp35/PDF/0962-0965%20%5B2023%5D%20MICROBIOLOGICAL%20ATTRIBUTES%20OF%20NONSTERILE%20NUTRITIONAL%20AND%20DIETARY%20SUPPLEMENTS.pdf
3. California Office of Environmental Health Hazard Assessment, Proposition 65 No Significant Risk Levels (NSRLs) and Maximum Allowable Dose Levels (MADLs). Retrieved 8 September 2026. https://oehha.ca.gov/proposition-65/general-info/proposition-65-no-significant-risk-levels-nsrls-and-maximum-allowable-dose-levels-madls
4. Codex Alimentarius Commission, General Standard for Contaminants and Toxins in Food and Feed, CXS 193-1995. Retrieved 8 September 2026. https://www.fao.org/fileadmin/user_upload/agns/pdf/CXS_193e.pdf
5. Food Standards Australia New Zealand, Australia New Zealand Food Standards Code, Schedule 19: Maximum levels of contaminants and natural toxicants (compilation in force 1 September 2022). Retrieved 8 September 2026. https://www.legislation.gov.au/F2015L00454/2022-09-01/2022-09-01/text/original/pdf
6. US Food and Drug Administration, Water Activity (aw) in Foods, Inspection Technical Guide. Retrieved 8 September 2026. https://www.fda.gov/inspections-compliance-enforcement-and-criminal-investigations/inspection-technical-guides/water-activity-aw-foods
7. United States Pharmacopeial Convention, General Chapter ⟨811⟩ Powder Fineness. Retrieved 8 September 2026. https://www.usp.org/harmonization-standards/pdg/general-chapters/powder-fineness
8. “Nutritional and functional properties of Moringa oleifera,” Journal of Agriculture and Food Research, 2020. Retrieved 8 September 2026. https://www.sciencedirect.com/science/article/pii/S2589936820300414
9. Potisate, Y. et al., “Changes during storage of dried Moringa oleifera leaves prepared by heat pump-assisted dehumidified air drying,” International Journal of Food Science and Technology 50(5):1224–1233, 2015. Retrieved 8 September 2026. https://academic.oup.com/ijfst/article/50/5/1224/7866959
10. “Different Temperature Storage Conditions and Packaging Types Affect Moringa oleifera Leaf Powder Quality,” Molecules 30(20):4048, 2025. Retrieved 8 September 2026. https://pmc.ncbi.nlm.nih.gov/articles/PMC12565920/
11. Gallaher, C. and Gallaher, D., “Iron Bioavailability from Moringa oleifera Leaves Is Very Low,” The FASEB Journal 31(1) supplement 786.13, 2017. Retrieved 8 September 2026. https://faseb.onlinelibrary.wiley.com/doi/abs/10.1096/fasebj.31.1_supplement.786.13
12. “Effect of drying temperature on physicochemical properties of Moringa oleifera leaf,” Livestock Research for Rural Development 33(11), 2021. Retrieved 8 September 2026. https://www.lrrd.org/lrrd33/11/33129ntgia.html

Written by the Silk Route Ventures Trade Team. Silk Route Ventures (E-Silk Route Ventures Ltd) is a Sri Lankan B2B supply-chain operator for the Food, Beverage, Wellness and Nutraceuticals sectors. The Silk Foods Ceylon manufacturing arm operates under BRCGS and FSSC 22000 V6. Questions or to request a sample: Contact us or email info@esilkroute.com.lk.