What Is Milk Thistle?

Milk thistle (Silybum marianum) is a thistle whose seeds contain silymarin, a standardized mixture of flavonolignans – silybin A and B, silydianin and silychristin – with silybin the most active. Silymarin is the most widely used botanical for liver-support formulas worldwide: it acts as an antioxidant in liver cells, supports glutathione status, and its activity in liver tissue is the subject of ongoing clinical research. Because seed powder alone contains only a few percent silymarin, extracts standardized to 80% are what make clinically meaningful dosing possible.

Key Facts at a Glance

• Active content: Silymarin 80% (UV/HPLC)
• CAS number: 65666-07-1
• Appearance: Light yellow to brown powder
• Grades: Conventional, water-soluble, acetone-soluble
• Key marker: Silybin content per batch
• Typical serving: 300-600 mg extract per day
• Packaging: 25 kg drum (custom formats available)
• Shelf life: 24 months in sealed, cool, dry storage

Origin & Sourcing

Extracted from Silybum marianum seeds harvested in established cultivation regions. Seeds are cleaned and cold-pressed or extracted, then the extract is purified and standardized to 80% silymarin with silybin isomers specified on the COA. The conventional grade suits capsules, the water-soluble grade disperses in drinks, and the acetone-soluble grade serves specialty formulations. Residual-solvent testing, heavy metals and microbiology complete the release panel on every batch.

Key Benefits

• Reference botanical for liver-support formulas worldwide
• Antioxidant flavonolignans with documented liver-cell activity
• Supports the glutathione antioxidant system
• 80% silymarin enables clinically meaningful doses
• Water-soluble grade opens beverage formats
• Silybin isomers specified per batch

Applications

Liver-support capsules, hangover and after-party shots, wellness drink mixes through the water-soluble grade, beauty formulas, pet liver-health products and antioxidant complexes. Milk thistle is also a standard companion in NAC and turmeric-based liver-support stacks. Beyond capsules, the water-soluble grade appears in hangover shots and liver-support teas, and the conventional grade blends into powder sachets. Liver-support formulas frequently combine it with NAC, choline and B-vitamins in multi-active products.

Why 2026 Matters

Liver-support formulas remain a durable supplement category, driven by alcohol-aware lifestyles, medication-load awareness and the liver-support and cleanse trend. Milk thistle is the category’s anchor ingredient with decades of brand recognition. What is changing is format: the water-soluble grade lets brands move from capsules into hangover shots and drink mixes, the fastest-growing corners of the category. Demand is broadening beyond the classic liver-support customer: hangover-recovery shots, alcohol-free lifestyle brands and beauty lines targeting clear skin all use milk thistle’s liver-support positioning. The water-soluble grade is what enables these drinkable formats. For OEM customers, milk thistle pairs with NAC and artichoke to form a complete liver-support platform from a single supplier relationship.

Science Snapshot

Silymarin’s flavonolignans scavenge free radicals in hepatocytes, inhibit lipid peroxidation and support glutathione synthesis, a central antioxidant molecule in liver tissue. In vitro work shows silymarin protects liver cells from toxins including alcohol metabolites, and clinical trials – while mixed in quality – report improvements in liver enzyme markers in published clinical research. Silybin is the best-studied component and is often delivered in phospholipid complexes to raise absorption. Mechanistically, silymarin concentrates in liver tissue after oral dosing and acts through several routes: free-radical scavenging, stabilization of hepatocyte membranes, inhibition of the inflammatory cytokine cascade and research on protein synthesis in liver cells. The last point is notable – silymarin is one of the few botanicals studied in liver-tissue research in preclinical models. Silybin, the major component, is the molecule most studied, and phospholipid-complexed silybin shows meaningfully higher plasma levels than the uncomplexed extract.

Quality & Specifications

• Actives: Silymarin 80% (UV/HPLC)
• Grades: Conventional, water-soluble, acetone-soluble
• Appearance: Light yellow to brown powder
• Packaging: 25 kg drums (custom formats available)
• Shelf life: 24 months in sealed, cool, dry storage
• Testing: UV/HPLC assay, silybin profile, residual solvents, heavy metals, ethylene oxide (EtO), aflatoxins, PAH, pyrrolizidine alkaloids (PAs)
• Compliance: Pesticide residue screened to EU MRLs (EC) 396/2005; Proposition 65 (Prop 65) statement and full contaminant documentation on request
• Note: Business-to-business ingredient information only. Not intended to diagnose, treat, cure or prevent any disease.

Safety & Regulatory

Well tolerated at 300-600 mg per day. Occasional mild GI effects are reported. Avoid in pregnancy and with known allergy to Asteraceae plants.

Formulation Notes

The conventional grade is capsule-friendly and light in taste, making it easy to combine in liver-support stacks. The water-soluble grade dissolves into shots and effervescents for hangover and wellness formats. Pairs with NAC, artichoke, dandelion and choline in liver formulas, and with glutathione or vitamin C in antioxidant lines. The acetone-soluble grade serves specialized delivery systems.

How It Compares

• Silymarin vs silybin phytosome: silymarin 80% is the cost-effective standard; silybin-phospholipid complexes raise absorption for premium positioning.
• Milk thistle vs NAC: both are used in liver-support formulas through different mechanisms – silymarin as antioxidant in liver cells, NAC as the glutathione precursor – and are frequently combined.
• 80% vs 30% silymarin: 80% concentrates actives for low-capsule dosing and label strength; 30% suits value herbal positioning.
• Conventional vs water-soluble: conventional suits capsules and tablets; water-soluble disperses in drinks and gummies.
• Milk thistle vs artichoke: artichoke is traditionally used in digestive formulas; silymarin protects liver cells – the two are the classic European liver-support pair.

Frequently Asked Questions (FAQ)

What is the silymarin content?

Standardized to 80% silymarin (UV/HPLC), with silybin isomers specified on every COA.

Can you provide a COA and third-party test report?

Yes. Every batch ships with a Certificate of Analysis, and third-party testing is available on request.

What is the MOQ and packaging?

Standard packaging is a 25kg drum. Please contact us for current MOQ and sample availability.

Which grade dissolves in water?

The water-soluble grade disperses in drinks, shots and effervescents; the conventional grade is designed for capsules.

What is the typical serving?

Common doses run 300-600 mg of 80% extract per day, usually split with meals.

Is it suitable for hangover formats?

Yes. The water-soluble grade is widely used in hangover shots and drink mixes, often with NAC and electrolytes.

Do you test residual solvents?

Yes. Residual-solvent testing is part of the standard release panel.

How to Get Started

1. Tell us your format and target dose – capsules, powders, tablets, gummies or beverages.
2. We confirm the matching grade, send the specification sheet and a free sample.
3. Approve the sample and run a trial batch; we lock the COA and lead time.
4. Scale to full production with batch-to-batch consistency guaranteed.