Gallic acid (Benzoic acid) is found in almost all plants. Plants known for their high gallic acid content include gallnuts,grapes,tea,hops and oak bark.

1. Octyl Gallate is an antioxidant approved by the US Food and Drug Administration (FDA) as a food additive. 2. Octyl Gallate has antimetastatic activity. 3. Octyl Gallate shows antimicrobial activity against H. pylori, with a minimum inhibitory concentration (MIC) value of 125 ug/mL. 4. Combination therapy with octyl gallate and ferulic acid improves cognition and neurodegeneration in a transgenic mouse model of Alzheimer's disease.5. Octyl Gallate is a potential anticancer agent, it exhibited decreased MCF-7 & MDA-MB-231 survival and induced apoptosis, with IC50 value of 40 uM. 6. Octyl gallate (Octyl 3,4,5-trihydroxybenzoate) has antiviral activity, it shows an inhibitory effect on the growth of herpes simplex virus type 1 (HSV-1) in HEp-2 or Vero cells. 7. Octyl gallate shows antifungal activity against Saccharomyces cerevisiae ATCC7754 and Zygosaccharomyces bailii ATCC 60483.

Ethyl gallate (gallic acid ethyl ester) obviously decreases cell proliferation in MDA-MB-231 and MCF-7 cells in a dose- and time-dependent manner, exhibits cytotoxicity in a dose-dependent manner. Ethyl gallate can inhibit the abilities of invasion of breast cancer in vitro by inhibiting the mRNA levels of MMP-9/MMP-2, phosphorylation of Akt and protein expression of NF-κB and inhibits hydrogen peroxide signaling, may represent an alternative class of vasopressors for use in septic shock. Also, Ethyl gallate suppresses proliferation and invasion in human breast cancer cells by modulating the PI3K/Akt pathway, which may contribute to inhibiting their downstream targets such as NF-κB p-65, Bcl-2/Bax, and mRNA levels of MMP-2 and MMP-9 in breast cancer cells, could be used as potential antioxidants with safe therapeutic application in cancer chemotherapy.

3,4,5-Trimethoxybenzoic acid (Gallic acid trimethyl ether) are potent antioxidants and inhibitor of cytokine production. It can ameliorate chronic stress-induced various behavioral and biochemical alterations in mice. It also exerts hepatoprotective effects in CCl4-induced rats, specifically by modulating oxidative-nitrosative stress and inflammation.

Propyl gallate (Gallic acid propyl esterZ) is an antioxidant used in foods especially animal fats and vegetable oils, also in a wide variety of cosmetics and beauty care products.

Gallic acid may be used as a standard in the photometric determination of total phenolics content by Folin-Ciocalteu method with potential role in epigenetic therapy of human cancers.

Syringic acid (3,5-dimethoxy-4-hydroxy Benzoic Acid) (SYRA) is a potential antioxidant used in traditional Chinese medicine and is an emerging nutraceutical. It has potential anti-angiogenic, anti-glycating, anti-hyperglycaemic, neuroprotective, and memory-enhancing properties.

Methyl gallate (Gallincin) is a reverse transcriptase inhibitor with antioxidant, anti-HIV-1 and HIV-1 enzyme inhibition activities.

Methyl EudesMate, synthesized from Gallic acid, has antioxidant activity and is commonly used in the production of sulfonamide synergist intermediates, trimethoprim (TMP) and many other drugs.

Pyrogallol (Piral) is a white crystalline powder and a powerful reducing agent prepared by heating gallic acid.

Methyl syringate (Syringic Acid Methyl Ester) has a unique inhibitory activity toward aflatoxin production with a different mode of action from that of gallic acid. Methyl syringate from K. pictus is a specific and selective activator of hTRPA1, can regulate food intake and gastric emptying through a TRPA1-mediated pathway and, by extension, can contribute to weight suppression.

Methyl 3-hydroxy-4,5-dimethoxybenzoate (3,4-Dimethoxy-5-hydroxybenzoic acid methyl ester) is a gallic acid derivative from Pinus sylvestris with antibacterial activity. In the presence of H2O2, Methyl 3-hydroxy-4,5-dimethoxybenzoate exhibits antioxidant properties.

1, 2, 3, 4, 6-Pentagalloylglucose (Penta-O-galloyl-β-D-glucose) and gallic acid from Pistacia lentiscus have antimutagenic and antioxidant activities. 2. 1, 2, 3, 4, 6-Penta-O-galloyl-beta-D-glucose (PGG) possesses potent anti-proliferative and anti-invasive effects, it also has inhibition of inducible nitric oxide synthase and cyclooxygenase-2 activity. 3. PGG may serve as a model for the development of new types of anti-diabetic and anti-metabolic syndrome therapeutics. 4. 1, 2, 3, 4, 6-Penta- O -galloyl-β- d -glucose has vasodilatory and anti-inflammatory effects, it dilates vascular smooth muscle and suppresses the vascular inflammatory process via endothelium-dependent nitric oxide (NO)/cGMP signaling. 5. 1, 2, 3, 4, 6-Penta-O-galloyl-beta-D-glucose can decrease the level of extracellular hepatitis B virus (HBV) (IC5, 1. microg/ml) in a dose-dependent manner, it also can reduce the HBsAg level by 25% at a concentration of 4 microg/ml; the gallate structure of PGG may play a critical role in the inhibition of anti-HBV activity, suggests that PGG could be a candidate for developing an anti-HBV agent. 6. 1, 2, 3, 4, 6-Penta-O-galloyl-β-D-glucose has anti-parasitic activity, displays an EC5 value of 67 μM, at least 6.6-fold more effective than the standard drug benznidazole against trypomastigote forms of T. cruzi.