Methyl chloride, also called chloromethane, mainly is used as a refrigerant. It’s known, that methyl chloride permeates through human epidermis when exposed at high atmospheric concentrations within relatively short timeframes. Recently published article has shown that chlorinated methyl group could be formed in humans, that might be an important target compound in future medical diagnostic programs.

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.

Methyl pyrrolidone (or N-methyl pyrrolidone or NMP) is a small molecule acetyl‐lysine mimetic compound with potent immunomodulatory and direct anti‐myeloma activity. NMP is nontoxic, stable and already in use as a solvent in biomedical applications. This compound is under investigation in clinical trial phase I for the treatment of multiple myeloma. The study will evaluate if the NMP can be safely administered to humans at doses, which induce measurable immunological and anti-tumor effects in patients with myeloma. In addition, NMP could be useful for bone fracture repairing. NMP has shown a protective role in osteoblast differentiation in response to hypoxia, and such protection was through inhibiting the NF-κB signaling. Experiments on rodents have revealed that the compound had a remarkable anti-osteoporotic ability preserving activity in the pulp-dentine complex and preventing jawbone loss. These effects made NMP a promising candidate for the preservation of the activity of the pulp-dentin complex and jawbone thickness in post-menopausal females.

Parabens are widely used preservatives in basic necessities such as cosmetic and pharmaceutical products. It was found, that butylparaben has estrogenic and antiandrogenic properties and is known to reduce sperm counts in rats following perinatal exposure. In addition was observed, that butylparaben exerted endocrine disrupting effects on both male and female offspring. In 2009-2010, 80 pregnant women from Ottawa Canada participated in the Plastics and Personal-Care Product Use in Pregnancy (P4) Study. Women kept a diary of products that they used 24 h prior to and during the collection. All parabens measured in maternal urine had moderate to high reproducibility. Women who used lotions in the past 24 h had significantly higher geometric mean paraben concentrations (80-110%) in their urine than women who reported no use in the past 24 h. Women who used shampoo, conditioner, and cosmetics also showed 70-80% higher butylparaben concentrations in their urine.

Methyl laurate (methyl dodecanoate), a flavouring agent, is found in alcoholic beverages.

Ethylparaben is produced naturally and found in several fruits and insects, where it acts as an antimicrobial agent. Ethylparaben is mainly used as antiseptics in cosmetics, food and medicine (E number E214). It is also can be used as feed preservatives and antiseptic for bacteria. Ethylparaben is readily absorbed from the gastrointestinal tract or through the skin. It is hydrolyzed to p-hydroxybenzoic acid and rapidly excreted in urine without accumulating in the body. Under the Federal Food, Drug, and Cosmetic Act (FD&C Act), cosmetic products and ingredients, other than color additives, do not need FDA approval before they go on the market. Broad concentration ranges reported in each product category in 1981 were < 0.1% and > 0.1% to 1%. Studies show the in vivo estrogenicity of MP and EP at human exposure levels, and indicate that populations exposed to large amounts of MP and EP may have a high burden of estrogenicity-related diseases.

Methyl stearate is a fatty acid methyl ester used as a nonionic surfactant in various experiments in helping solubilize a variety of chemical species by dissociating aggregates and unfolding proteins. Methyl stearate is one of the key fatty acid methyl ester (FAME) component of biodiesel fuel produced by the transesterification of triglyceride oil and a primary alcohol.

Skatole or 3-methylindole is a mildly toxic white crystalline organic compound belonging to the indole family. It is formed in the intestine by the bacterial decomposition of l-tryptophan and found in fecal matter, to which it imparts its characteristic odor. Skatole is a partial AhR agonist. Skatole is used in perfume compositions and in artificial Civet bases.