Milk Thistle Extract for Nutraceutical & Supplement Brands

Why Milk Thistle Specification Matters for Supplement Manufacturers

For nutraceutical brands, the commercial and regulatory value of milk thistle (Silybum marianum) depends entirely on the extract grade and its documented marker-compound content. A finished capsule product lives or dies by the silymarin standardisation on the COA — and that COA must reflect the assay method used, because silymarin figures are not interchangeable between UV-spectrophotometry and HPLC. HPLC gives compound-specific data; UV gives a broader, often higher apparent figure. Regulators and sophisticated retailers increasingly expect HPLC-declared values.

---

Forms & Specifications Relevant to This Application

Standardised Dry Extract (Primary Grade for Capsules & Tablets)

The workhorse specification for supplement finished goods is a dry extract standardised to 70–80% silymarin complex by HPLC, delivered as a free-flowing powder. Within silymarin, the key individual flavonolignans tracked on a full-profile COA include silybin A, silybin B, isosilybin A, isosilybin B, silychristin, and silydianin. Silybin (the sum of A and B isomers) is the most pharmacologically studied and is sometimes declared separately alongside total silymarin.

Particle size is a functional capsule-filling parameter. For standard automatic capsule-filling lines, a D90 ≤ 150 µm (verified by laser diffraction) ensures flowability and fill-weight consistency. Coarser material causes bridging and weight variation; overly fine powder (<10 µm D50) may create electrostatic and dustiness issues on the line. Buyers should specify particle size distribution on the purchase order and expect it on the COA.

Solvent of extraction must be declared. Food-grade and feed-grade ethanol or acetone are common; any residual solvent must comply with ICH Q3C limits as applied under EU pharmaceutical context, and food-supplement buyers should request residual solvent data as a COA line item.

Additional Forms Available

• Milled seed powder (80–200 mesh): used in lower-dose or whole-food positioning products; silymarin content is naturally lower (~1.5–3% in seed) and is not comparable to extract grades.
• Water-soluble / phytosome-complexed forms: phosphatidylcholine-complexed silybin (e.g., silybin-phosphatidylcholine complex) for enhanced-bioavailability positioning — available on request; requires additional documentation.
• Liquid extract (hydroalcoholic): niche use in drops or tinctures; standardisation by HPLC also applies.

---

COA Specifications: What to Require Per Batch

A batch COA for capsule-grade milk thistle extract should include at minimum:

• Identity: botanical name (Silybum marianum (L.) Gaertn.), plant part (fruit/seed), extraction ratio
• Silymarin content (%) — assay method must be stated: HPLC preferred; UV result should be flagged as such
• Individual flavonolignan profile (silybin A+B, isosilybin A+B, silychristin, silydianin) for full-profile batches
• Moisture / loss on drying (typically ≤5% for dry extract)
• Heavy metals: Lead, Cadmium, Mercury, Arsenic — limits per EU Regulation 2023/915 (contaminants in food) and/or pharmacopoeial limits
• Pesticide residues: compliance with EU Regulation 396/2005 MRL framework
• Microbiology: Total Aerobic Count, Yeasts & Moulds, E. coli, Salmonella — per Ph. Eur. 5.1.4 or equivalent food-grade standard
• Particle size distribution (D10/D50/D90 by laser diffraction)
• Residual solvents (if solvent extraction used)
• Batch number, manufacture date, retest/expiry date, country of origin

TANDOR provides a full COA per batch from each supply partner, cross-checked against these parameters before shipment.

---

EFSA Health Claim Status

As of the current EFSA register, no authorised health claim under EU Regulation 1924/2006 exists for milk thistle or silymarin for use on food supplements sold to the general public. Claims relating to liver function or hepatoprotective effects are not permitted on supplement labels in the EU without authorisation. Brands must rely on traditional use framing where applicable, or structure their marketing around ingredient information rather than outcome claims. Buyers should verify the current EFSA register and seek regulatory counsel for their specific label copy.

---

Certifications & Regulatory Frameworks

• EU-Organic: Certified under EU Regulation 2018/848 (replacing 834/2007), with valid organic certificate from an accredited control body. Organic-certified milk thistle extract is available from select origins; certificate scope (wild-harvested vs. cultivated) affects label claims.
• GMP compliance: Extract manufacturers supplying supplement brands should operate under EU GMP or equivalent (ISO 22000 / FSSC 22000 for food-grade); documentation available on request.
• Novel Food status: Milk thistle fruit and standardised silymarin extracts are not listed as novel foods under EU Regulation 2015/2283 for traditional food uses; buyers should confirm intended use and form with their regulatory team.
• COSMOS / Ecocert: Available for cosmetic-application grades where relevant.

---

Origin, MOQ & Supply Realities

Milk thistle is cultivated across Central and Eastern Europe (including Romania, Hungary, Poland), as well as China and India. Origin matters for several reasons:

• EU-grown material simplifies pesticide residue compliance and traceability under EU Regulation 178/2002 (General Food Law).
• Non-EU origins (China, India) offer higher volume availability and sometimes lower cost, but require robust incoming QC and supplier auditing.
• TANDOR works with verified extract manufacturers across multiple origins, allowing buyers to specify EU-origin or multi-origin blended supply depending on their positioning and cost target.

MOQ for standardised extract is typically 25 kg per batch for sample/development quantities, scaling to 100–500 kg for commercial runs, though this varies by origin and certification status. Organic-certified material often carries higher MOQs due to smaller certified cultivation areas.

Lead times range from 2–6 weeks depending on stock position and origin; TANDOR maintains pre-qualified supplier relationships to compress sourcing timelines for qualified buyers.

---

Why Source Milk Thistle Through TANDOR

TANDOR is a Romania-based EU sourcing intermediary specialising in botanical raw materials. For nutraceutical buyers, the practical advantages are:

• Multi-origin access from a single EU contact point, with the ability to switch or blend origins without rebuilding supplier relationships
• Per-batch COA provision before shipment, reviewed against your specification sheet
• EU-Organic certified options with valid third-party certification documentation
• EU regulatory familiarity — understanding of contaminant limits, GMP expectations, and EFSA framework as standard
• Direct supplier transparency: TANDOR does not obscure the supply chain; origin and manufacturer information is shared with qualified buyers under NDA where required