Tomatine

Tomatine is a steroidal glycoalkaloid saponin found primarily in tomato plants (Solanum lycopersicum), concentrated in leaves, stems, and unripe fruit. Preliminary computational studies suggest it may inhibit cancer-related proteins including CDK2 and BRAF through hydrophobic binding interactions, though no human clinical trials have confirmed these effects.

Origin & History

Tomatine (α-tomatine) is a steroidal glycoalkaloid found primarily in green tomatoes (Solanum lycopersicum) and other parts of the tomato plant including leaves, stems, roots, flowers, and calyxes. It is extracted using methods such as methanolic solvent systems with physical disruption, UHPLC-MS/MS with acetonitrile/formic acid gradients, or solvents like 70% ethanol, chloroform, and petroleum ether, with chloroform yielding up to 2.50% tomatidine from green tomatoes.

Historical & Cultural Context

No historical or traditional medicinal uses of tomatine are documented in the available research. It is primarily studied as a plant defense metabolite in modern analytical contexts.

Health Benefits

• Potential cancer inhibition through protein binding (preliminary in silico evidence only - CDK2, BRAF, VEGFA, JAK1, SMO proteins)
• May affect cancer-related signaling cascades (preliminary computational docking studies only)
• Possible anti-proliferative effects via hydrophobic protein interactions (in silico modeling only)
• Natural plant defense compound properties (no human evidence)
• Potential phytosteroid activity through tomatidine aglycone (theoretical based on structure)

How It Works

Tomatine is proposed to exert anti-proliferative effects by binding hydrophobically to cell cycle and signaling proteins, including cyclin-dependent kinase 2 (CDK2), the oncogenic kinase BRAF, vascular endothelial growth factor A (VEGFA), Janus kinase 1 (JAK1), and Smoothened (SMO) — all key nodes in cancer-related cascades. As a saponin, tomatine also complexes with membrane cholesterol, disrupting lipid bilayer integrity and potentially altering transmembrane signaling. These proposed mechanisms derive exclusively from in silico molecular docking simulations and have not been validated in cell, animal, or human studies.

Scientific Research

No human clinical trials, RCTs, or meta-analyses on tomatine were identified in the available research. Current evidence is limited to extraction methodology studies, in vitro/in silico cancer inhibition modeling through protein docking simulations, and plant content analysis, with no PubMed PMIDs for human studies provided.

Clinical Summary

No human clinical trials have been conducted on tomatine as an isolated supplement. Available evidence consists entirely of computational (in silico) molecular docking studies that model binding affinity to cancer-associated proteins, offering hypothesis-generating but non-confirmatory data. A small number of in vitro and rodent studies have examined crude tomato alkaloid fractions, but these do not isolate tomatine's individual contribution or establish pharmacokinetically relevant dosing. The overall evidence base is preclinical and preliminary; any therapeutic claims would be premature and unsupported by current research standards.

Nutritional Profile

Tomatine is a steroidal glycoalkaloid compound, not a macronutrient or micronutrient contributor in nutritional terms. Molecular formula: C50H83NO21, molecular weight approximately 1034.2 g/mol. It is not a source of calories, protein, fat, fiber, vitamins, or minerals in any meaningful dietary quantity. Found naturally in green/unripe tomatoes (Solanum lycopersicum) at concentrations of approximately 100-500 mg/kg fresh weight, dropping dramatically to <5 mg/kg in fully ripe red tomatoes as it converts to tomatidine and other metabolites during ripening. Tomatine consists of the aglycone tomatidine bound to a tetrasaccharide unit (lycotetraose: two glucose, one galactose, one xylose residue). Bioavailability is notably low in humans due to poor intestinal absorption; it is largely hydrolyzed by gut microbiota or passes unabsorbed. It forms complexes with membrane cholesterol (3-beta-hydroxysterols), which underlies both its biological activity and limited systemic bioavailability. Tomatine is present in tomato leaves and stems at higher concentrations (2,000-5,000 mg/kg dry weight) than in fruit. As an isolated compound supplement or food ingredient, it contributes negligible macronutrient or micronutrient value; its relevance is entirely as a bioactive phytochemical with pharmacological rather than nutritional properties.

Preparation & Dosage

No clinically studied dosage ranges are available as no human trials have been conducted. Analytical standards use ≥90% purity α-tomatine or ≥99% tomatidine for research purposes only. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Other glycoalkaloids, phytosterols, lycopene, vitamin C, quercetin

Safety & Interactions

Tomatine is present in very low concentrations in ripe tomatoes and is generally considered safe at dietary exposure levels, but isolated or supplemental doses lack established safety profiles in humans. High doses in animal models have demonstrated gastrointestinal toxicity, hemolytic activity consistent with saponin membrane disruption, and potential hepatotoxicity. No formal drug interaction studies exist, but theoretical concern exists for interactions with cholesterol-lowering medications due to tomatine's cholesterol-complexing properties. Tomatine supplementation is not recommended during pregnancy or lactation given the complete absence of safety data in these populations.