Methyl 3,4-dihydroxybenzoate (Protocatechuic acid methyl ester), a key metabolite of antioxidant polyphenols in green tea, exhibits significant antioxidant and anti-inflammatory properties.

Luteolin (Luteolol) belongs to the flavonoid group of natural products and is a Nrf2 inhibitor, PDE inhibitor. Luteolin has a wide range of biological activities including antitumor, antioxidant, anti-inflammatory, antimicrobial, antiviral, antiallergic, and procoagulant.

Oltipraz (RP 35972) is a synthetic dithiolethione with potential chemopreventive and anti-angiogenic properties. Oltipraz induces phase II detoxification enzymes, such as glutathione S transferase (GST) and NAD(P)H: quinone oxidoreductase 1 (NQO1). The induction of detoxification enzymes enhances the detoxification of certain cancer-causing agents, thereby enhancing their elimination and preventing carcinogen-induced DNA damages. Although the exact mechanism through which the anti-angiogenesis effect remains to be fully elucidated, oltipraz maybe able to modulate the expression of a number of angiogenic factors, thereby blocking the sustained and focal neovascularization in multiple tumor cell types.

Ezetimibe (SCH 58235) is a dietary cholesterol absorption inhibitor that exerts its physiologic effect by decreasing cholesterol absorption.

TBHQ (tert-Butylhydroquinone) is an antioxidant that induces an antioxidant response through the redox-sensitive transcription factor Nrf2.

Pyridoxine (Vitamin B6) is the 4-methanol form of vitamin B6 and is converted to pyridoxal 5-phosphate in the body. Although pyridoxine and vitamin B6 are still frequently used as synonyms, especially by medical researchers, this practice is erroneous and sometimes misleading.

L-Cystine dihydrochloride is an Nrf2 inducer with whitening and anti-dark spot effects.L-Cystine dihydrochloride has cytoprotective effects in cells, and is often added to various fungal cultures as a carbon source.

Curcumin (Natural Yellow 3) is a phenolic natural product, an inhibitor of histone acetyltransferase p300/CREB (IC50=25 μM) with specificity. Curcumin has a wide range of pharmacological activities such as antitumor, anti-inflammatory and antioxidant.