Gallic acid / AntiBio Cancer Research Results

GA, Gallic acid: Click to Expand ⟱
Features:
Phenolic acid found in gallnuts, sumac, witch hazel, tea leaves, oak bark. Has antioxidant, antimicrobial and anti-obesity properties.
The GA derivatives include two types: ester and catechin derivatives. The most common ester derivatives of GA are alkyl esters, which are composed mainly of methyl gallate (MG), propyl gallate (PG), octyl gallate (OG), dodecyl gallate (DG), tetradecyl gallate (TG), and hexadecyl gallate (HG), and some of the main catechin derivatives are epicatechin (EC), epicatechin gallate (ECG), epigallocatechin (EGC), gallocatechin gallate (GCG), and epigallocatechin gallate (EGCG)

Gallic acid is a naturally occurring polyphenol found in a variety of plant-based foods. Some of the best dietary sources include:

Fruits:
Berries (strawberries, blackberries, blueberries)
Grapes, including red wine (grapes are rich in polyphenols)
Pomegranates and apples
Nuts and Seeds: Walnuts and almonds have been noted to contain GA in their skins
Herbs and Spices: Tea (especially green tea), Sumac and other spices
Other Plants: Gallnuts (from oak trees)

Pathways:
-ROS generation in tumor cells is frequently reported, Antioxidant behavior dominates in normal tissue models -Apoptosis Induction: Activating caspase cascades, Shifting Bax versus Bcl-2, MMP, cyt-c release -Cell Cycle Arrest: typ @ G1 or G2/M checkpoints.
-Anti-inflammatory Effects: inhibiting NF-κB
-reported Angiogenesis Inhibition:
-Modulation of Signaling Pathways: MAPK Pathway, PI3K/Akt Pathway Inhibition, p53 Pathway

Gallic acid exhibits a complex behavior with ROS in cancer cells, acting as both an antioxidant and a pro-oxidant depending on the context and its concentration:

Antioxidant Effects at Low Doses:
-At lower concentrations, gallic acid is typically characterized by its ability to scavenge free radicals, thus reducing oxidative stress.
This antioxidant property may help protect normal cells from DNA damage, reducing the risk of mutations that could lead to cancer.

Pro-oxidant Effects at High Doses: >50-100uM?
-Capable of biphasic redox behavior (antioxidant in normal cells, pro-oxidant in some tumor contexts) -At higher concentrations, GA can exert pro-oxidant effects, generating ROS within cancer cells. Elevated ROS levels can overwhelm the cellular antioxidant defenses of cancer cells, leading to oxidative stress, mitochondrial dysfunction, and ultimately cell death.

Oral bioavailability is well absorbed but subject to rapid conjugation (glucuronide/sulfate/methylated metabolites). Many cytotoxic in-vitro concentrations are in the 10–100 µM range, often higher than typical plasma levels after dietary intake.

Gallic acid — Gallic acid is a naturally occurring trihydroxybenzoic phenolic acid and plant secondary metabolite with antioxidant, pro-oxidant, anti-inflammatory, antimicrobial, and extensively studied preclinical anticancer activity. It is formally classified as a low-molecular-weight polyphenolic phenolic acid and is commonly abbreviated GA. Its chemical identity is 3,4,5-trihydroxybenzoic acid. Dietary and botanical sources include gallnuts, sumac, tea, grapes, berries, pomegranate, mango, walnuts, oak bark, and hydrolysable tannins. GA is also released during digestion or microbial metabolism of gallotannins and galloylated polyphenols. Its anticancer effects are strongly concentration-, cell-type-, redox-, and exposure-dependent.

Primary mechanisms (ranked):

  1. Biphasic redox modulation, with ROS generation and oxidative stress predominating in susceptible cancer cells at cytotoxic concentrations, but ROS scavenging and NRF2-linked antioxidant protection predominating in many normal or inflamed tissues.
  2. Mitochondrial apoptosis through mitochondrial membrane depolarization, Bax/Bcl-2 imbalance, cytochrome-c release, caspase activation, and PARP cleavage.
  3. Suppression of oncogenic survival signaling, particularly PI3K/AKT, STAT3, EGFR, and context-dependent MAPK signaling.
  4. Cell-cycle arrest through modulation of p53, p21, p27, cyclins, and cyclin-dependent kinases, commonly at G1 or G2/M depending on the model.
  5. Suppression of inflammatory and tumor-promoting transcription through NF-κB inhibition and reduced COX-2, IL-6, TNF-α, and related mediators.
  6. Inhibition of angiogenesis through PTEN/AKT/HIF-1α/VEGF signaling and reduced endothelial or tumor-associated vascular responses.
  7. Suppression of invasion, migration, epithelial-mesenchymal transition, and matrix-remodelling pathways, including MMP2, MMP9, Wnt/β-catenin, and selected EMT regulators.
  8. Metabolic disruption through context-dependent inhibition of glycolysis, LDH-associated lactate metabolism, lipid synthesis, and other tumor bioenergetic processes.
  9. Therapy sensitization reported with selected cytotoxic and targeted agents, including paclitaxel, carboplatin, camptothecin, and olaparib, but currently supported mainly by cell-culture evidence.

Bioavailability / PK relevance: GA can be absorbed orally and is among the more readily absorbed simple polyphenols, but absorption is followed by rapid methylation, glucuronidation, sulfation, microbial transformation, and urinary elimination. Circulating exposure consists substantially of conjugated and microbial metabolites rather than persistent free GA. Formulation strategies such as nanoparticles, conjugates, and encapsulation can increase exposure experimentally, but these delivery systems remain investigational.

In-vitro vs systemic exposure relevance: Many anticancer experiments use approximately 10–100 µM GA, with pronounced pro-oxidant cytotoxicity frequently occurring toward the upper portion of this range or above it. These free-compound concentrations commonly exceed sustained plasma concentrations expected from ordinary dietary intake. Consequently, direct systemic anticancer effects demonstrated at high micromolar exposure may not be achievable through food consumption or conventional oral supplementation. Local gastrointestinal exposure, metabolites, tissue accumulation, or engineered delivery could produce different exposure relationships.

Clinical evidence status: Preclinical. GA has extensive cell-culture evidence and a smaller body of animal evidence across multiple tumor types. Human pharmacokinetic and food-intervention studies confirm exposure to GA and its metabolites, but isolated GA has not established anticancer efficacy in randomized clinical trials and is not an approved cancer therapy. Human studies involving polyphenol-rich mango, pomegranate, tea, grape, or botanical preparations cannot be attributed specifically to GA. Therapy-sensitizing activity remains experimental and should not be used to justify combining GA supplements with chemotherapy outside clinical supervision.

Gallic Acid Mechanistic Profile

Rank Pathway / Axis Cancer Cells Normal Cells TSF Primary Effect Notes / Interpretation
1 Biphasic redox modulation ROS ↑; oxidative stress ↑ (dose-dependent) (model-dependent) ROS ↓; radical scavenging ↑; antioxidant capacity ↑ P, R Selective redox destabilization Pro-oxidant tumor effects are most evident at higher in-vitro concentrations; antioxidant effects dominate in many non-malignant injury models.
2 Mitochondrial apoptosis Mitochondrial membrane potential ↓; Bax ↑; Bcl-2 ↓; cytochrome-c ↑; caspases ↑; PARP cleavage ↑ ↔ or apoptosis ↓ under oxidative injury (context-dependent) R, G Intrinsic apoptotic cell death Frequently downstream of ROS accumulation, although mitochondrial and apoptotic responses vary by tumor genotype and concentration.
3 PI3K AKT survival signaling PI3K ↓; p-AKT ↓; mTOR signaling ↓ (model-dependent); PTEN ↑ ↔ or AKT-associated cytoprotection ↑ during inflammatory injury R, G Growth and survival suppression Direction can differ between malignant cells and stressed normal tissues; pathway effects should be entered with context qualifiers.
4 Cell-cycle checkpoints p53 ↑; p21 ↑; p27 ↑; cyclin D1 ↓; cyclin E ↓; G1 or G2/M arrest ↑ ↔ G Cytostasis Arrest phase is model-dependent and should not be generalized to one checkpoint.
5 NF-κB inflammatory signaling NF-κB ↓; COX-2 ↓; IL-6 ↓; TNF-α ↓; pro-survival inflammation ↓ NF-κB ↓; inflammatory cytokines ↓; epithelial protection ↑ R, G Anti-inflammatory and anti-survival signaling One of the more reproducible effects across tumor and non-tumor inflammatory models.
6 MAPK stress signaling JNK ↑; p38 ↑; ERK ↓ or ↔ (context-dependent) Pathologic p38 and ERK activation ↓ or protective signaling ↑ (context-dependent) P, R Stress-response reprogramming MAPK direction depends on cell type, initiating stress, exposure duration, and whether apoptosis or cytoprotection is being measured.
7 Angiogenesis and hypoxia signaling PTEN ↑; AKT ↓; HIF-1α ↓; VEGF ↓; angiogenesis ↓ ↔ G Anti-angiogenic activity Supported by selected ovarian, cervical, and other experimental cancer models; not clinically validated.
8 Invasion and epithelial-mesenchymal transition MMP2 ↓; MMP9 ↓; Wnt/β-catenin ↓; EMT ↓; migration ↓; invasion ↓ ↔ or epithelial barrier integrity ↑ G Anti-invasive phenotype Often secondary to NF-κB, AKT, MAPK, and Wnt pathway modulation.
9 NRF2 antioxidant response NRF2 ↑ or ↓ (context-dependent); HO-1 ↑ or ↓; redox adaptation altered NRF2 ↑; HO-1 ↑; GSH ↑; SOD ↑; catalase ↑ R, G Secondary redox adaptation NRF2 activation is generally cytoprotective in normal tissue but may protect some cancers; prostate-cancer findings indicate model-dependent alteration of the NRF2 HO-1 BACH1 axis.
10 Glycolysis and lipid metabolism LDH activity ↓; lactate production ↓; FASN ↓; glycolytic dependence ↓ (model-dependent) ↔ R, G Metabolic growth restriction The evidence base is smaller and less consistent than that for redox modulation and apoptosis; avoid treating glycolysis inhibition as universal.
11 DNA damage and repair balance DNA damage ↑; p53 response ↑; FEN1 ↓ in nanoparticle studies; repair capacity ↓ (model-dependent) Oxidative DNA damage ↓ at antioxidant exposure R, G Genotoxic stress in cancer cells Free GA and GA-containing nanocarriers are not mechanistically interchangeable; nanoparticle-specific findings require separate qualification.
12 Chemosensitization Paclitaxel response ↑; carboplatin response ↑; camptothecin response ↑; olaparib response ↑ (model-dependent) Chemotherapy-associated injury ↓ or ↔ in limited models G Adjunctive treatment sensitization Evidence is primarily in vitro. Both antioxidant protection and pro-oxidant sensitization are possible, making unsupervised clinical combinations inappropriate.
13 Immune checkpoint and tumor immunity PD-L1 ↓; CD8-positive T-cell activity ↑; antitumor immune response ↑ (model-dependent) Immune homeostasis modulation ↔ G Immune sensitization Promising animal evidence exists, but direct clinical immunotherapy enhancement has not been demonstrated.
14 Clinical Translation Constraint Free systemic GA exposure ↓; conjugation ↑; metabolism ↑; cytotoxic target exposure often not reached Dietary exposure generally tolerated; high-dose isolated exposure insufficiently characterized R, G Exposure and evidence limitation Rapid metabolism, uncertain tumor delivery, formulation heterogeneity, high in-vitro concentrations, and absence of isolated-GA cancer trials limit translation.

P: 0–30 min    R: 30 min–3 hr    G: >3 hr
AntiBio, Antibiotic/Antimicrobial activity: Click to Expand ⟱
Source:
Type:

Antibiotic / antimicrobial activity: The ability of a substance to suppress or kill microorganisms, especially bacteria, by disrupting microbial survival, growth, biofilm formation, cell-wall integrity, membrane function, protein synthesis, nucleic-acid synthesis, quorum sensing, or virulence.

Natural Products that might have antimicrobial properties

Natural supplement or product Principal constituents Potential antimicrobial activity Evidence assessment Reference
Garlic
Allium sativum		 Allicin, ajoene and diallyl sulfides Antibacterial and antifungal activity, with some antiviral and antiparasitic effects reported in laboratory studies. Extensive laboratory evidence, but insufficient clinical evidence to use garlic as a treatment for established infections. Tesfaye A. Revealing the therapeutic uses of garlic and its potential for drug discovery. Scientific review.
Berberine Berberine isoquinoline alkaloid May damage bacterial membranes, inhibit efflux pumps, interfere with nucleic-acid and protein synthesis, and inhibit biofilm formation. Strong preclinical evidence and limited indication-specific clinical evidence. Poor oral bioavailability and drug interactions limit its use as a general antimicrobial. Berberine as a therapeutic alkaloid against ESKAPE and multidrug-resistant bacteria: a comprehensive review.
Cranberry extract
Vaccinium macrocarpon		 A-type proanthocyanidins Primarily reduces adhesion of uropathogenic bacteria, particularly Escherichia coli, to urinary epithelial cells. May reduce recurrent urinary tract infections in selected populations. It is preventive rather than a reliable treatment for an active UTI. National Center for Complementary and Integrative Health: Cranberry—Usefulness and Safety.
Probiotics
Lactobacillus, Bifidobacterium and Saccharomyces boulardii 		Live microorganisms; effects are strain-specific Competitive exclusion of pathogens, production of bacteriocins, inhibition of pathogen adhesion and restoration of microbiome function. Some human evidence for antibiotic-associated diarrhea and selected gastrointestinal or vaginal indications. Results cannot be generalized from one strain to another. NIH Office of Dietary Supplements: Probiotics—Health Professional Fact Sheet.
Medical-grade honey / Manuka honey Methylglyoxal, hydrogen peroxide, defensin-1, organic acids and high osmolarity Broad topical antibacterial and antibiofilm activity; also supports autolytic debridement and wound healing. Clinically relevant primarily as a standardized, medical-grade topical wound product. Ordinary food honey is not equivalent. Jull AB et al. Honey as a topical treatment for wounds. Cochrane systematic review.
Oregano oil
Origanum vulgare		 Carvacrol and thymol Antibacterial, antifungal and antibiofilm activity, largely through disruption of microbial membranes. Strong laboratory activity, but inadequate human evidence for oral treatment of infections. Concentrated oil can cause irritation. Chemical composition, biological activity and potential uses of oregano and oregano essential oil: a review.
Thyme
Thymus vulgaris		 Thymol and carvacrol Antibacterial, antifungal and antibiofilm activity through membrane damage and altered microbial permeability. Better established as a constituent of topical antiseptic and oral-care formulations than as an oral treatment for systemic infection. PubMed literature: thyme, thymol and antimicrobial activity.
Tea tree oil
Melaleuca alternifolia		 Terpinen-4-ol and related monoterpenes Topical antibacterial and antifungal activity with some antiviral laboratory activity. Some clinical evidence for topical acne and fungal skin conditions. Tea tree oil is toxic when swallowed and may cause contact dermatitis. Carson CF et al. Melaleuca alternifolia oil: a review of antimicrobial and other medicinal properties.
Echinacea
Echinacea species		 Alkamides, caffeic-acid derivatives, polysaccharides and glycoproteins Primarily immunomodulatory; relatively weak and inconsistent direct antimicrobial activity. Evidence for preventing or shortening respiratory infections is inconsistent and preparation-dependent. National Center for Complementary and Integrative Health: Echinacea—Usefulness and Safety.
Elderberry
Sambucus nigra		 Anthocyanins, flavonols and phenolic acids Antiviral effects have been reported in cell-culture and preclinical studies, including interference with viral entry or replication. Small human trials have examined respiratory symptoms, but evidence remains insufficient to establish treatment of influenza or other viral infections. National Center for Complementary and Integrative Health: Elderberry.
Curcumin / turmeric
Curcuma longa		 Curcumin and related curcuminoids Antibacterial, antifungal, antiviral and antibiofilm activity through multiple membrane, enzyme and signalling effects. Predominantly laboratory evidence. Poor aqueous solubility and low systemic bioavailability are major clinical limitations. Moghadamtousi SZ et al. A review on antibacterial, antiviral and antifungal activity of curcumin.
Ginger
Zingiber officinale		 Gingerols, shogaols and zingerone Antibacterial and antifungal activity, including possible inhibition of microbial adhesion and biofilm formation. Primarily laboratory evidence; there is little direct clinical evidence that ginger supplements treat infections. PubMed literature: ginger, gingerols and antimicrobial activity.
Clove
Syzygium aromaticum		 Eugenol and eugenyl acetate Antibacterial, antifungal and local antiseptic activity, principally through membrane and protein disruption. Relevant mainly to topical, food-preservation and dental applications. Evidence for systemic infection treatment is insufficient. PubMed literature: clove, eugenol and antimicrobial activity.
Cinnamon
Cinnamomum species		 Cinnamaldehyde, eugenol and cinnamic acid derivatives Antibacterial, antifungal and antibiofilm activity; may alter microbial membranes and quorum-sensing pathways. Predominantly laboratory evidence. Cassia cinnamon can contribute substantial coumarin exposure when consumed in concentrated amounts. PubMed literature: cinnamon, cinnamaldehyde and antimicrobial activity.
Neem
Azadirachta indica		 Nimbidin, nimbin, nimbolide, azadirachtin and other limonoids Antibacterial, antifungal, antiparasitic and antibiofilm effects have been reported. Some topical and dental research exists, but systemic clinical evidence is inadequate. Oral neem preparations have important safety concerns. PubMed literature: Azadirachta indica and antimicrobial activity.
Black seed
Nigella sativa		 Thymoquinone, thymohydroquinone and related volatile compounds Antibacterial, antifungal, antiparasitic and possible antiviral activity. Considerable laboratory research but limited, heterogeneous clinical evidence for infectious diseases. PubMed literature: Nigella sativa, thymoquinone and antimicrobial activity.
Green tea extract
Camellia sinensis		 Epigallocatechin gallate (EGCG) and other catechins Antibacterial, antiviral and antibiofilm activity; may damage membranes, inhibit microbial enzymes and enhance some antibiotics. Some localized oral-health evidence, but limited evidence for treating systemic infections. Concentrated extracts may cause liver injury in susceptible individuals. PubMed literature: EGCG, green tea and antimicrobial activity.
Licorice root
Glycyrrhiza species		 Glycyrrhizin, glycyrrhetinic acid, liquiritigenin and other flavonoids Antiviral, antibacterial and antifungal effects have been reported in laboratory and preclinical studies. Limited clinical antimicrobial evidence. Glycyrrhizin can cause hypertension, hypokalemia, fluid retention and clinically important drug interactions. National Center for Complementary and Integrative Health: Licorice Root.
Andrographis
Andrographis paniculata		 Andrographolide and related diterpenoid lactones Immunomodulatory, anti-inflammatory and possible antiviral or antibacterial activity. Some evidence for modest symptom reduction in uncomplicated respiratory infections, but this does not establish direct pathogen eradication. PubMed literature: Andrographis and respiratory infections.
Pelargonium sidoides Proanthocyanidins, phenolic acids and oxygenated coumarin derivatives Possible antiviral, antibacterial anti-adhesive and immunomodulatory activity. Some human evidence for modest symptom improvement in acute bronchitis and selected respiratory infections. It is not a substitute for antibiotics when bacterial treatment is indicated. Timmer A et al. Pelargonium sidoides extract for acute respiratory tract infections. Cochrane systematic review.
Monolaurin
Glycerol monolaurate		 Monolaurin, a monoester derived from lauric acid May disrupt lipid membranes and interfere with signalling or virulence in certain bacteria and enveloped viruses. Predominantly laboratory and animal evidence. There is insufficient clinical evidence to recommend oral monolaurin for infections. PubMed literature: glycerol monolaurate and antimicrobial activity.
Caprylic acid Octanoic acid, an eight-carbon medium-chain fatty acid Antifungal and membrane-disrupting activity, particularly against Candida species, has been reported in vitro. Insufficient human evidence for treating candidiasis or systemic fungal infection. Marketing claims commonly exceed the evidence. PubMed literature: caprylic acid and Candida.
Olive leaf extract
Olea europaea		 Oleuropein, hydroxytyrosol and elenolic-acid derivatives Antibacterial, antiviral and antifungal activity has been observed in laboratory studies. Preliminary evidence only; clinical trials have not established it as a treatment for infectious disease. PubMed literature: olive leaf, oleuropein and antimicrobial activity.
Goldenseal
Hydrastis canadensis		 Hydrastine, canadine and berberine Extracts and individual alkaloids show antibacterial activity in laboratory studies. There is no good clinical evidence that goldenseal treats human infections. Product composition, absorption and drug interactions are important limitations. National Center for Complementary and Integrative Health: Goldenseal.
Sweet wormwood / artemisinin
Artemisia annua 		Artemisinin and related sesquiterpene lactones Artemisinin derivatives are potent antimalarial agents. Additional antibacterial, antiviral and antiparasitic effects are being studied. Artemisinin-based combination therapies are established medicines, not ordinary supplements. Herbal preparations should not replace standardized malaria treatment because dose variability can promote treatment failure and resistance. World Health Organization: Guidelines for malaria.

Evidence interpretation

  • Clinical evidence: Effects have been studied in human participants, but usually for a specific preparation, route, dose and indication.
  • Preclinical evidence: Activity has mainly been demonstrated in cell culture, microbial cultures or animal models.
  • Anti-adhesive or probiotic activity: The product may reduce colonization or pathogen attachment without directly killing the microorganism.
  • Topical evidence: Results from topical use cannot be assumed to apply to an orally administered supplement.


Scientific Papers found: Click to Expand⟱
7028- GA,    Gallic acid: Pharmacological activities and molecular mechanisms involved in inflammation-related diseases
- Review, Nor, NA
*toxicity↓, *Inflam↓, *NF-kB↓, AntiTum↑, Bacteria↓, *AntiDiabetic↑, *Obesity↓, *AntiBio↑, *Stroke↓, *NO↓, *PGE2↓, *IL6↓, *MAPK↓, *TNF-α↓, *IL1β↓, *MCP1/CCL2↓, *ICAM-1↓, *TIMP1↓,

Showing Research Papers: 1 to 1 of 1

* indicates research on normal cells as opposed to diseased cells
Total Research Paper Matches: 1

Pathway results for Effect on Cancer / Diseased Cells:


Functional Outcomes(tgid=23) ⓘ

AntiTum↑, 1,  

Infection & Microbiome(tgid=24) ⓘ

Bacteria↓, 1,  
Total Targets: 2

Pathway results for Effect on Normal Cells:


NA, unassigned(tgid=0) ⓘ

AntiBio↑, 1,   Stroke↓, 1,  

Cell Death(tgid=5) ⓘ

MAPK↓, 1,  

Migration(tgid=13) ⓘ

TIMP1↓, 1,  

Angiogenesis & Vasculature(tgid=14) ⓘ

NO↓, 1,  

Immune & Inflammatory Signaling(tgid=16) ⓘ

ICAM-1↓, 1,   IL1β↓, 1,   IL6↓, 1,   Inflam↓, 1,   MCP1/CCL2↓, 1,   NF-kB↓, 1,   PGE2↓, 1,   TNF-α↓, 1,  

Clinical Biomarkers(tgid=22) ⓘ

IL6↓, 1,  

Functional Outcomes(tgid=23) ⓘ

AntiDiabetic↑, 1,   Obesity↓, 1,   toxicity↓, 1,  
Total Targets: 17

Scientific Paper Hit Count for: AntiBio, Antibiotic/Antimicrobial activity
Query results interpretion may depend on "conditions" listed in the research papers.
Such Conditions may include : 
  -low or high Dose
  -format for product, such as nano of lipid formations
  -different cell line effects
  -synergies with other products 
  -if effect was for normal or cancerous cells

Filter Conditions: Pro/AntiFlg:%  IllCat:%  CanType:%  Cells:%  prod#:82  Target#:1483  State#:%  Dir#:2
  wNotes=0  sortOrder:rid,rpid

 

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