Home Ingredients Phosphocomplex® (Silybin Phytosome — Indena)
Liver HealthMetabolic Health

Phosphocomplex® (Silybin Phytosome — Indena)

Silybum marianum
Evidence Level
Limited
1 Clinical Trial
4 Documented Benefits
2/5 Evidence Score

Phosphocomplex® is a silybin phytosome from Indena, in which silybin (the main active of milk thistle) is bound to phosphatidylcholine to greatly improve its otherwise poor absorption. Silybin is studied for supporting liver health and protecting liver cells from oxidative and metabolic stress.

Studied Dose A standardized daily dose providing bioavailable silybin.
Active Compound Silybin (from milk thistle, Silybum marianum) complexed with phosphatidylcholine (a phytosome) for enhanced absorption.

Benefits

Liver support

Silybin is studied for supporting liver health and protecting liver cells, the traditional use of milk thistle, with the phytosome improving how much reaches the body.

Supported by Trial 1

Antioxidant protection

Silybin is a strong antioxidant that helps defend liver and other cells against oxidative damage.

Supported by Trial 1

Improved absorption

The phosphatidylcholine complex greatly improves silybin's bioavailability compared with ordinary milk thistle extract.

Supported by Trial 1

Lower insulin resistance score in a 12-month fatty liver trial

Tested as a silybin and phosphatidylcholine phytosome co-formulated with vitamin E; the paper does not name Phosphocomplex. In a 12-month double-blind trial in adults with biopsy-confirmed fatty liver, HOMA insulin resistance improved on the combination but not on placebo. Only 138 of 179 finished, and vitamin E's share is unknown. Pooled trials of silymarin, the parent extract, show lower fasting glucose with high heterogeneity.

Supported by Trial 1

Mechanism of action

1

Phytosome absorption

Binding silybin to phosphatidylcholine creates a lipid-compatible complex that crosses the gut wall far more efficiently than free silybin.

2

Hepatoprotective antioxidant action

Silybin stabilizes liver-cell membranes, scavenges free radicals, and supports liver-cell regeneration pathways.

Clinical trials

1
Silybin Cocrystals — Formulation Solubility & Bioavailability (a different delivery form)
PubMed

Study of a silybin COCRYSTAL formulation with improved solubility and bioavailability — a different delivery form than the phytosome. (Zhu et al. 2025, Pharmaceuticals)

Laboratory and bioavailability assessment.

A cocrystal formulation of silybin — a different delivery form than the Phosphocomplex phytosome — showed markedly higher solubility and bioavailability, illustrating the general poor-solubility problem that formulation approaches (including the phytosome) aim to solve. It is not a study of Phosphocomplex itself, and human outcome data for the silybin phytosome are limited.

Side effects and drug interactions

Common Potential side effects

Generally well-tolerated — adverse effects are uncommon at normal doses.
Mild digestive upset is occasionally reported.
Discontinue if any unusual reaction occurs.

Important Drug interactions

Drugs metabolized by the liver — silybin can affect certain enzymes; consult a doctor.
Diabetes medication — silybin may affect blood sugar; monitor.
Tell your doctor if you have a liver condition or take medication.

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Frequently asked questions about Phosphocomplex® (Silybin Phytosome — Indena)

What is Phosphocomplex?

Phosphocomplex® is a silybin phytosome from Indena, in which silybin (the main active of milk thistle) is bound to phosphatidylcholine to greatly improve its otherwise poor absorption. Silybin is studied for supporting liver health and protecting liver cells from oxidative and metabolic stress.

What is Phosphocomplex used for?

Phosphocomplex is researched primarily for Liver Health and Metabolic Health. Silybin is studied for supporting liver health and protecting liver cells, the traditional use of milk thistle, with the phytosome improving how much reaches the body.

What is the recommended dosage of Phosphocomplex?

The clinically studied dose is A standardized daily dose providing bioavailable silybin. Always follow the product label and check with a healthcare provider for personal advice.

Is Phosphocomplex safe, and does it have side effects?

Side effects and cautions reported for Phosphocomplex include: Generally well-tolerated — adverse effects are uncommon at normal doses. Mild digestive upset is occasionally reported. It may also interact with some medications. Phosphocomplex is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Phosphocomplex interact with any medications?

Possible interactions include: Drugs metabolized by the liver — silybin can affect certain enzymes; consult a doctor. Diabetes medication — silybin may affect blood sugar; monitor. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Phosphocomplex?

NutraSmarts rates the evidence for Phosphocomplex as Limited (2 out of 5). It is backed by 1 study summary and 3 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(3 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Zhu B, Ding Z, Rong X, et al. Silybin Cocrystals with Improved Solubility and Bioavailability. Pharmaceuticals (Basel). 2025;18(1)..PubMedUsed to support: Illustrates the general poor-solubility rationale for enhanced silybin delivery using a cocrystal formulation — a different delivery form than the phytosome; not direct evidence for Phosphocomplex.
  2. Loguercio C, Andreone P, Brisc C, Brisc MC, Bugianesi E, Chiaramonte M, Cursaro C, Danila M, de Sio I, Floreani A, Freni MA, Grieco A, Groppo M, Lazzari R, Lobello S, Lorefice E, Margotti M, Miele L, Milani S, Okolicsanyi L, Palasciano G, Portincasa P, Saltarelli P, Smedile A, Somalvico F, Spadaro A, Sporea I, Sorrentino P, Vecchione R, Tuccillo C, Del Vecchio Blanco C, Federico A. Silybin combined with phosphatidylcholine and vitamin E in patients with nonalcoholic fatty liver disease: a randomized controlled trial. Free Radic Biol Med. 2012;52(9):1658-65..PubMedUsed to support: 12-month multicenter double-blind placebo-controlled RCT of Realsil (silybin phytosome with phosphatidylcholine, co-formulated with vitamin E) taken orally twice daily in adults with histologically documented NAFLD. 179 treated, 41 withdrawn, 138 analyzed per protocol. HOMA insulin resistance, liver enzymes and liver histology improved on Realsil but not on placebo. This backs the insulin-resistance benefit. It is a combination product, not Phosphocomplex alone.
  3. Soleymani S, Ayati MH, Mansourzadeh MJ, Namazi N, Zargaran A. The effects of Silymarin on the features of cardiometabolic syndrome in adults: A systematic review and meta-analysis. Phytother Res. 2022;36(2):842-856..PubMedUsed to support: Meta-analysis of 11 clinical trials of silymarin (the parent milk thistle extract, not the phytosome). Fasting blood glucose was lower than placebo (WMD -17.96 mg/dL, I2 82.4%), along with HbA1c and lipids, with high heterogeneity. This backs the class-level fasting glucose sentence only.