Oak bark (Quercus robur), also known as white oak, comes from the bark of a tree in the Fagaceae family. The bark from the oak tree, the only part that is used medicinally, is harvested from March to April. White oak bark is recognized as an herbal remedy that is generally safe and is listed on the FDA's GRAS list—meaning “generally recognized as safe.” The German Commissioner has approved the use of oak bark for the treatment of diarrhea, and it has been listed on the US Pharmacopoeia since 1916 for its astringent and antiseptic qualities. Oak bark is known for its strong astringent properties and for treating infections of the mouth, bleeding gums, acute diarrhea, skin conditions, wounds, burns, and cuts.

The seeds of fennel are used for their anti-inflammatory, deep-cleansing, detoxifying, revitalizing, antimicrobial, and circulatory stimulant properties. The active constituents of fennel seed include terpenes, fatty acids, protein, flavonoids, phenol carboxylic acids, and coumarins. Best for normal to dry and mature skin, fennel seed is used in facial steams, cleansers, soaps, anti-wrinkle creams, and lotions. It also helps to calm unevenly colored or blotchy skin. 

Euphrasia officinalis is a wild plant native to Europe, which is called "drinkable eye drops". Long used in herbal medicine, it is typically touted as a natural remedy for eye problems, such as conjunctivitis and eyestrain. It contains compounds called tannins, which can possess anti-inflammatory properties.