Challenges with Oral Silybin Products

Silybin is primarily administered orally but has low solubility, low permeability, and low bioavailability. Approximately20% to 50% of its active components are absorbed after oral administration, with about 80% secreted via bile and10% entering the enterohepatic circulation, resulting in low oral bioavailability.

Liposomal Silybin ：

Liposomes are microvesicles composed of lipid bilayers, with a hydrophilic exterior and a lipophilic core. This uniquestructure allows them to encapsulate both water-soluble and lipid-soluble substances. lmportantly, the bilayelstructure of liposomes is similar to that of human cell membranes, enabling them to easily cross cell membranesFormulating silybin into liposomes can sianificantly enhance its bioavailability.

Product Specifications：

Numerous pharmacokinetic studies have shown that liposomal silybin improve bioavailability in both healthy individuals and patients with chronic liver disease. Research indicates that silybin liposomes achieve over 10 times higher bioavailability compared to conventional silymarin tablets. Several studies in animals and humans have demonstrated that silybin complexed with phosphatidylcholine exhibits superior bioavailability compared to non-complexed forms.

Efficacy of Silybin：

The mechanisms of action of silybin include antioxidant, anti-inflammatory, anti-fibrotic, immunomodulatory, metabolic regulation, stimulation of protein regeneration, promotion of hepatocyte regeneration, and enhancement of milk secretion.

1. Antioxidant Mechanism: Silybin’s antioxidant effects are linked to phenolic antioxidants within cells, preventing free radical formation, scavenging free radicals, and inhibiting lipid peroxidation of membranes (regulating membrane permeability).

2. Anti-inflammatory and Immunomodulatory Mechanisms: Silybin’s anti-inflammatory effects are associated with the structure of various cells and their pathways.

3. Anti-fibrotic Mechanism: Silybin exerts anti-fibrotic effects on the liver directly or indirectly.

4. Hepatocyte Membrane Protection: Silybin protects hepatocytes through multiple mechanisms, including binding to hepatocyte membrane proteins, inhibiting lipid .

peroxidation to stabilize membrane permeability, supporting the liver’s synthesis of protective substances, and preventing damage from harmful substances.

Regulatory Status：

l China: Used as a raw material in health food products.

l Canada: Health Canada’s Food and Nutrition Directorate has evaluated the safety of milk thistle seed extract based on available data and concluded that there is sufficient evidence to confirm its safe use as a supplemental ingredient in food supplements under specific conditions. Health Canada permits the use of milk thistle seed extract (silymarin) as a supplemental ingredient in food supplements, with a maximum daily dose of 600 mg.

Advantages of Liposomal Silybin：

1. Use of Sunflower Lecithin as Encapsulation Material: Sunflower lecithin, with its high oleic acid content, offers superior antioxidant properties, reducing oxidation and rancidity during storage and extending product shelf life.

2. Freeze-Drying Process: Significantly slows the oxidation rate of phospholipids, delaying lipid degradation and improving drug encapsulation efficiency.

3. High Silybin Content and Bioavailability: Ensures a high concentration of active ingredients with enhanced bioavailability.