What sieve grade of Milk Thistle is best for pyramid tea bags?

A 2–5 mm cut-and-sifted (C&S) grade is the most widely used for pyramid and standard flat tea bags. It flows reliably through most filling-machine augers without bridging, brews evenly within a 3–5 minute steep, and keeps dust and fines below levels that cause bag permeability issues. Sieve analysis per ISO 3310-1 should be confirmed on each batch Certificate of Analysis.

Is irradiation permitted for organic Milk Thistle tea products in the EU?

No. EU-Organic Regulation 2018/848 explicitly prohibits the use of ionising radiation on organic products. For tea-grade material carrying an organic label, pathogen reduction must use permitted methods such as steam sterilisation. Using irradiated material would invalidate the organic status of the finished product.

What microbiological limits apply to Milk Thistle supplied for herbal tea production?

Tea-grade herbal material destined for the EU market is typically tested against Ph. Eur. section 5.1.8 guidance for non-sterile herbal preparations: TAMC ≤10⁷ CFU/g, TYMC ≤10⁵ CFU/g, absence of Salmonella spp. in 25 g, and absence of (or controlled limits for) E. coli. Exact limits should be agreed in the product specification, and TANDOR supplies accredited laboratory test reports for each batch.

What is the minimum order quantity for tea-grade organic Milk Thistle from TANDOR?

Qualification and sampling batches typically start at 25 kg, allowing manufacturers to run in-house QC, brew tests, and sensory evaluation before committing to production volumes. Full production orders are supplied on full-pallet and multi-pallet basis. TANDOR can consolidate Milk Thistle with other botanical ingredients into a single shipment, which is practical for blenders sourcing multiple herbs simultaneously.

Milk Thistle for Herbal Tea Manufacturers

What Tea & Infusion Manufacturers Need from Milk Thistle

For blending and single-herb infusion lines, the most critical sourcing decisions around Milk Thistle are physical form and sieve grade, flavour and colour stability, microbial safety method, and organic certification traceability. Getting any one of these wrong means either a failed QC hold or a product that brews poorly and loses shelf appeal.

---

Forms & Sieve Grades for Tea Applications

Cut-and-sifted (C&S) leaf, stem, and flower head material is the standard tea-grade form, allowing even extraction, consistent brew colour, and compatibility with standard pyramid-bag and flat tea-bag filling lines. Whole dried flower heads are occasionally specified for loose-leaf and display packaging but require additional sifting at the blending stage.

For seed-forward blends (where the silymarin content is the marketing focus), coarsely milled or cracked seed in a 1–3 mm fraction is preferred over whole seed, which releases flavour and colour compounds slowly and inconsistently during typical 3–5 minute steeping times.

Common sieve grades supplied for tea applications:

2–5 mm C&S — standard pyramid and flat-bag filling; passes most bag-fill equipment without bridging
3–8 mm C&S — loose-leaf blends, retail tins, and cold-brew sachets
<2 mm (tea cut / fannings) — fast-infusion single-serve formats; requires confirmation against dusty fines limits
Whole dried flower heads — display-quality loose-leaf and botanicals-on-top formats

Sieve analysis (sieve stack per ISO 3310-1) and particle size distribution should be confirmed on every batch Certificate of Analysis.

---

Flavour, Colour, and Appearance Retention

Milk Thistle's characteristic pale amber brew and mild, slightly bitter, hay-like flavour are sensitive to post-harvest handling. High moisture at harvest (above ~10–12% at intake) accelerates mould growth and causes browning of the bracts and pappus, which then bleeds undesirable dark sediment into the infusion.

Key processing factors that protect tea-grade quality:

Rapid low-temperature drying (belt or tray drying at ≤45 °C for organic-compliant material) preserves the natural green-silver colouration of the leaves and bracts
Moisture on delivery ≤10% (aligned with general Ph. Eur. guidance for dried herbal substances) prevents in-bag browning and caking during storage
UV-opaque, nitrogen-flushed packaging extends colour stability over typical 18–24 month shelf life
Absence of visible mould, insect damage, and extraneous matter — these are inspected against visual standards agreed in the product specification sheet before shipment

---

Microbiological Limits & Pathogen Reduction

Tea-grade herbal material is subject to stricter microbial limits than extract-grade, because the end consumer receives a minimally processed product. EU market expectations follow the general herbal tea monograph guidance within the Ph. Eur. (section 5.1.8, "Microbiological quality of herbal medicinal products for oral use") and food-safety requirements under Regulation (EC) No 178/2002.

Typical acceptance criteria for tea-grade Milk Thistle:

Total Aerobic Microbial Count (TAMC): ≤10⁷ CFU/g (herbal teas, non-sterile)
Total Yeast and Mould Count (TYMC): ≤10⁵ CFU/g
**Absence of *Salmonella* spp.** in 25 g
**Absence of *E. coli*** (or ≤10² CFU/g depending on specification)

Steam Sterilisation vs. Irradiation

Steam sterilisation (autoclave-based or continuous steam treatment) is the preferred pathogen-reduction method for EU organic tea manufacturers, because irradiation is prohibited for organic products under EU-Organic Regulation 2018/848 (Article 20). Irradiation also cannot be stated on an organic label under EU labelling rules.

For non-organic lines, gamma irradiation (permitted under Directive 1999/2/EC when declared) achieves lower microbial counts but can degrade heat-sensitive flavour volatiles and may affect the natural colour profile — a relevant trade-off for premium tea positioning.

All batches supplied by TANDOR include a microbial test report from an accredited EU laboratory as part of the Certificate of Analysis package.

---

Certifications That Matter for This Buyer Type

EU-Organic (Reg. 2018/848): Required for "organic" label claims across all EU member states. Certification must cover the operator in the supply chain, not just the farm. TANDOR works with certified operators and can supply organic certificates traceable to the certifying control body.
EU Pesticide MRLs (Reg. 396/2005): Pesticide residue testing is included in the CoA for organic and conventional material, with results referenced against current EU MRL schedules.
Heavy metals: Tested per Regulation (EC) No 1881/2006 limits applicable to foodstuffs, covering lead, cadmium, mercury, and arsenic.
ISO 22000 / FSSC 22000 processing: Preferred at the processing facility level for buyers with retailer audit requirements.
Non-GMO declaration: Available; Milk Thistle is not a GM crop, but a written non-GMO declaration is provided on request for label or retailer compliance.

---

Origin, MOQ, and Supply Realities

Milk Thistle is a robust, widely cultivated species with established production in Romania, Hungary, Poland, and North Africa (primarily Morocco and Egypt). Romanian and Hungarian origins offer shorter transport times, lower carbon footprint, and simpler organic certification traceability within the EU regulatory framework.

Minimum order quantities for tea-grade C&S material typically begin at 25 kg for sampling and qualification batches, scaling to full-pallet and multi-pallet orders for production runs. TANDOR can consolidate smaller quantities across multiple botanical lines in a single shipment, reducing logistics overhead for blenders managing diverse ingredient portfolios.

Seasonal availability follows the July–September harvest window in Central and Eastern Europe. Forward purchasing against a confirmed specification is recommended for manufacturers requiring colour or flavour consistency across production seasons.

---

Why Source via TANDOR?

As a Romania-based EU sourcing intermediary, TANDOR provides:

Multi-origin access — Romania, Hungary, Poland, and North Africa evaluated and pre-screened against your specification
Batch-specific Certificate of Analysis including sieve analysis, moisture, microbiological results, pesticide screen, and heavy metals, from accredited EU laboratories
EU-Organic traceability with full chain-of-custody documentation under Reg. 2018/848
Single contact point for qualification, documentation, and reorder — removing the need to manage separate grower and processor relationships
Steam-sterilised material available for organic tea lines, with sterilisation records included in the batch documentation

Milk Thistle for Herbal Tea & Infusion Manufacturers