Zentonil Chew Tablet (S)

Vetoquinol Zentonil Chew is a clinically advanced, palatable hepatic support supplement formulated by Vetoquinol specifically for dogs and cats suffering from liver function impairment, chronic hepatic disease, or conditions that place sustained oxidative burden on liver cells. The liver is the body's primary detoxification organ, responsible for metabolising drugs, processing nutrients, synthesising plasma proteins, and neutralising endogenous and exogenous toxins and when its function is compromised, the consequences ripple across virtually every physiological system in your companion's body. Zentonil Chew targets this problem at its biochemical root, combining the gold-standard veterinary hepatoprotectant S-adenosylmethionine (SAMe) with Silybin complexed with phospholipids from milk thistle, Vitamin E, Boswellia serrata, Curcuma longa, and Apium graveolens a multi-targeted botanical and nutraceutical formula designed to replenish depleted glutathione stores, reinforce hepatocellular regeneration, and reduce hepatic inflammation through complementary, synergistic mechanisms. Crucially, each SAMe particle in Zentonil Chew is individually microencapsulated and enteric-coated prior to incorporation into the chew, ensuring gastric-resistant delivery and maximum bioavailability of this acid-sensitive active.

Ingredients:

S-Adenosylmethionine (SAMe) 200 mg per chew:

(Stable tosylate salt; microencapsulated, individually enteric-coated)

SAMe is the body's universal methyl donor a naturally occurring compound synthesized endogenously in the hepatocyte from the amino acid methionine and adenosine triphosphate (ATP) via the enzyme methionine adenosyltransferase. In a healthy liver, SAMe is produced in abundance and serves three critical biochemical roles: transmethylation (donating methyl groups to DNA, proteins, phospholipids, and neurotransmitters), transsulfuration (serving as the precursor to cysteine and ultimately glutathione), and aminopropylation (supporting polyamine synthesis essential to cell proliferation and repair). When the liver is diseased or under oxidative stress, hepatic SAMe synthesis collapses a catastrophic consequence because SAMe is the rate-limiting precursor to glutathione (GSH), the cell's most powerful endogenous antioxidant. Depleted GSH leaves hepatocytes defenseless against reactive oxygen species (ROS), accelerating lipid peroxidation, mitochondrial dysfunction, and hepatocellular death. Exogenous supplementation of SAMe directly replenishes the hepatic SAMe pool, restores GSH synthesis, reinforces membrane phospholipid integrity through transmethylation, and has been shown in peer-reviewed veterinary studies to support hepatocellular regeneration. The tosylate salt used in Zentonil is the most stable and bioavailable pharmaceutical-grade form of SAMe, and the individual microencapsulation of each SAMe particle in an enteric coating protects it from gastric acid degradation, ensuring that active SAMe reaches the small intestinal mucosa intact for maximal absorption.

Silybin / Phospholipids Complex 50 mg per chew:

(Silybin 16.5 mg + Phosphatidylcholine 33.5 mg; from Silybum marianum)

Silybin is the most pharmacologically active flavonolignan of silymarin the standardised extract of milk thistle (Silybum marianum) whose hepatoprotective properties have been documented for centuries and validated in contemporary peer-reviewed veterinary and human hepatology literature. At the cellular level, silybin exerts its primary action as a potent free-radical scavenger, neutralising ROS within the hepatocyte, inhibiting lipid peroxidation of hepatocyte membrane phospholipids, and directly suppressing pro-inflammatory cytokine production (including TNF-α). Silybin also inhibits the uptake of hepatotoxic substances into hepatocytes by competing for transport receptor binding sites, reducing the intracellular accumulation of toxins. Critically, in Zentonil's formulation, silybin is complexed with phosphatidylcholine a naturally occurring phospholipid. This complexation dramatically increases the oral bioavailability of silybin by converting it from a poorly lipid-soluble compound into a lipophilic complex that is efficiently absorbed via the intestinal lymphatic pathway. Phosphatidylcholine itself additionally reinforces hepatocyte membrane integrity by replenishing the phospholipid bilayer of damaged liver cell membranes.

Vitamin E (Alpha-Tocopherol):

Vitamin E is a fat-soluble, chain-breaking antioxidant that intercepts and quenches lipid peroxyl radicals within cell membranes halting the cascade of oxidative membrane damage that characterises hepatocellular injury. In the liver, Vitamin E works synergistically with SAMe-derived glutathione and with silybin to provide a multi-tiered antioxidant defence each operating in distinct intracellular compartments to provide overlapping, comprehensive free-radical neutralisation.

Boswellia serrata (Indian Frankincense Resin Extract):

Boswellic acids, the primary bioactive constituents of Boswellia serrata resin, exert potent anti-inflammatory effects in the liver by selectively inhibiting 5-lipoxygenase (5-LOX) the enzyme responsible for leukotriene synthesis and by suppressing Nuclear Factor kappa-B (NF-κB) activation, a central transcription factor driving the expression of pro-inflammatory mediators. In the context of hepatic disease, this targeted anti-inflammatory action alleviates the chronic hepatic inflammation that perpetuates fibrotic progression and further hepatocellular damage, supporting the liver's recovery environment.

Curcuma longa (Turmeric Curcuminoids):

The bioactive polyphenols of Curcuma longa, collectively known as curcuminoids (with curcumin as the principal compound), modulate hepatic inflammation through simultaneous inhibition of NF-κB, reduction of hepatic stellate cell activation (a key driver of hepatic fibrosis), and upregulation of Nrf2 the master transcription factor that triggers the cell's own antioxidant and cytoprotective enzyme expression. Curcuminoids also support bile secretion and biliary function, facilitating the liver's detoxification throughput during recovery phases.

Apium graveolens (Celery Seed Extract):

Apium graveolens seed extract provides phthalides and flavonoids phytochemical compounds with demonstrated hepatoprotective, anti-inflammatory, and diuretic properties. In the hepatic context, these compounds support detoxification enzyme activity in liver cells, reduce oxidative stress markers in hepatic tissue, and support mild diuresis that assists in clearing metabolic waste products during liver recovery, complementing the primary actives' direct hepatoprotective actions.