Isopropyl Stearate is an ester of isopropyl alcohol and stearic acid that used as binder, emollient, and moisturizer in the pharmaceutical and cosmetic industries. Stearate esters act primarily as lubricants on the skin's surface, which gives the skin a soft and smooth appearance. Isopropyl Stearate has the unique properties of low viscosity and oily nature, which results in a nongreasy, hydrophobic film when applied to the skin or lips. Undiluted Isopropyl Stearate was classified as a slight ocular irritant.

HYDROXYETHYLETHYLENEDIAMINETRIACETIC ACID (HEDTA) is used in cosmetics and care products. It’s a chelating agent, which in combination with selenium was effective in reducing the concentration of Al and level of DNA damage. In addition, experiments with rodents have shown that combination of HEDTA and propolis preserved histological features, mitigated oxidative stress and improved liver, kidney, and brain functions more profoundly.

Phenethyl alcohol, or 2-phenylethanol, is an aromatic alcohol with a rosy scent. It is widely used in the food, fragrance, and cosmetic industries. It is used in the formulation of eye area makeup, skin care products, shampoos, perfumes, and colognes. Promising sources of natural 2-phenylethanol are microorganisms, especially yeasts, which can produce it by biosynthesis and biotransformation.

Octisalate used as an ingredient in sunscreens and cosmetics. Maximum FDA-approved concentration - 5%. Range of protection - UVB. Might develop contact allergic dermatitis

Sulfur dioxide (SO2) is a colorles, highly toxic gas with a choking or suffocating odor. It is used as a pharmaceutical aid and antioxidant. It reacts easily with other substances to form harmful compounds, such as sulfuric acid, sulfurous acid and sulfate particles. About 99% of the sulfur dioxide in air comes from human sources. The main source of sulfur dioxide in the air is industrial activity that processes materials that contain sulfur, eg the generation of electricity from coal, oil or gas that contains sulfur. Some mineral ores also contain sulfur, and sulfur dioxide is released when they are processed. In addition, industrial activities that burn fossil fuels containing sulfur can be important sources of sulfur dioxide. Sulfur dioxide affects human health when it is breathed in. It irritates the nose, throat, and airways to cause coughing, wheezing, shortness of breath, or a tight feeling around the chest. The effects of sulfur dioxide are felt very quickly and most people would feel the worst symptoms in 10 or 15 minutes after breathing it in. Sulfur dioxide is used to increase the storage life and preserve the color and flavor of fruits and vegetables and as a disinfectant in breweries, wineries and food factories. It prevents the formation of nitroamines in beer and reduces free chlorine after water treatment. It is used as a bleaching agent in the textile, paper pulp, wool and fresh produce industries and as a fumigant for grain and against lice and mites in veterinary practice. It also serves as a chemical intermediate in the manufacture of chlorine dioxide, sodium sulfate, thionyl chloride and organic sulfonates. It is used as a reducing agent of iron in mineral processing, as a cleaning agent for metallic oxides, as an oxidizing agent in lithium batteries, as an oxygen scavenger and extractive solvent in petroleum refining, in glass manufacture and as a neutralizing agent. SO2 can be generated endogenously in mammals. In contrast to the toxic effects of SO2, protective effects have also been found in mammals. Endogenous SO2 has antioxidant, anti-inflammatory, anti-hypertension, and anti-atherogenic effects and regulates vascular tone and cardiac function in mammals. SO2 may have a dual role in regulating physiological and pathophysiological effects in mammals. Studies have shown that SO2 can also regulate levels of lipid metabolism. In male Sprague–Dawley rats on a normal or a high cholesterol diet, inhalation of 5 ppm and 10 ppm SO2 gas (for 14 days) increased plasma triglyceride levels and decreased high-density lipoprotein cholesterol levels. However, in rats treated with a high cholesterol diet for 8 weeks, plasma total cholesterol increased and high-density lipoproteincholesterol decreased. After treatment with an SO2 donor the plasma levels of triglyceride and low-density lipoprotein cholesterol were markedly decreased. In addition, the SO2 donor significantly decreased atherosclerotic lesions. These data suggest that SO2 regulates lipid metabolism. The mechanism may be related to upregulation of the disturbed endogenous H2S pathway, increased plasma glutathione peroxidase (GSH-Px), superoxide dismutase (SOD) activities, aortic tissue SOD1 and SOD2 protein expression, and decreased malondialdehyde generation. The antioxidant effect of SO2 might involve one of these mechanisms, which could directly prevent the progression of atherosclerotic lesions. Sulfur dioxide and its derivatives have significant vasodilatory effects. SO2 decreased systolic blood pressure in spontaneously hypertensive rats which may be related to its vasorelaxing effect. Compared with exogenous SO2 vasoactive effects, it was discovered that endogenous SO2 had an important vasorelaxing function which is necessary for maintaining normal blood vascular tone.

Aminomethylpropanol is a synthetic ingredient that functions as a buffer to adjust the pH of cosmetics and personal care products. In cosmetics and personal care products, aminomethylpropanol is used in the formulation of creams and lotions, hair sprays, wave sets, hair dyes and colors, eye and facial products, and other hair and skin care products. The main function of aminomethylpropanol in these products is to establish and hold the pH. The Food and Drug Administration (FDA) includes aminomethylpropanol on its list of indirect food additives as a component of adhesives that are in contact with food. The European Chemicals Agency (ECHA) identifies that “substance causes serious eye irritation, is harmful to aquatic life with long lasting effects and causes skin irritation, causes serious eye damage.” Toxicologically significant concentrations of AMP are unlikely to be achieved in the systemic circulation and/or target tissues in humans as a result of dermal application of products containing aminomethylpropanol. Systemically absorbed dose will be rapidly eliminated from the body with little remaining at the application site.

Linalool (3,7-dimethyl-1,6-octadien-3-ol) is a very fragrant component of various herbs such as lavender, mint, and coriander that can be a potent skin irritant, causing contact dermatitis in some sensitive individuals. Linalool is used as a scent in perfumed hygiene products and cleaning agents including soaps, detergents, shampoos, and lotions. Linalool is used by pest professionals as a flea, fruit fly, and cockroach insecticide. It can also be used a method of pest control for codling moths. Linalool creates a synergistic effect with the codling moth's pheromone called codlemone, which increases the attraction of males. Linalool can be absorbed by inhalation of its aerosol and by oral intake or skin absorption, potentially causing irritation, pain and allergic reactions.

Squalane is an emollient used as cosmetic ingredient. It naturally occurs in small amounts in the lipid layers of skin, and along with its precursor squalene, prevents moisture loss while restoring skin’s suppleness and flexibility. It is soluble in all common cosmetic media, and can be used without limits in all types of formulations being non-toxic and a non-irritant. It is used in skin care products as an active or inactive ingredient and can be used in emulsion composition in vaccines and some drug compositions. Squalane is a hydrogenated squalene - a natural product first extracted from shark liver oil, and later isolated from olive and palm oils. In a pure state, it is a mobile, colorless, odorless and tasteless hydrocarbon oil with good physical and chemical stability. Up to date, anticancer, antioxidant, drug carrier, detoxifier, skin hydrating, and emollient activities of squalane have been reported both in animal models and in vitro environments.