Methionine is an non-polar, aliphatic, essential α-amino acid that is used in the biosynthesis of proteins. High levels of methionine can be found in eggs, sesame seeds, Brazil nuts, fish, meats and some other plant seeds; methionine is also found in cereal grains. Most fruits and vegetables contain very little of it. Most legumes are also low in methionine. However, it is the combination of methionine and cystine which is considered for completeness of a protein. There is scientific evidence that restricting methionine consumption can increase lifespans in some animals. However, since methionine is an essential amino acid, it cannot be entirely removed from animals' diets without disease or death occurring over time. For example, rats fed a diet without methionine developed steatohepatitis (fatty liver), anemia and lost two thirds of their body weight over 5 weeks. Administration of methionine ameliorated the pathological consequences of methionine deprivation.

Phenyl salicylate belongs to the family of hydroxybenzoic acid derivatives. Phenyl salicylate is used as a food additive. Antimycobacterial activity of phenyl salicylates (salols) was studied in connection with antituberculotic activity of salicylic derivatives. Phenyl salicylates are esters. Phenyl salicylates (salols) represent a new group of antimycobacterial compounds. Phenyl salicylate is included in the number of medications, indicated for the treatment of symptoms of irritative voiding, used to relieve the discomfort, pain, frequent urge to urinate, and cramps/spasms of the urinary tract caused by an infection or a medical procedure. Phenyl salicylate works as a pain reliever in these combinations.

Quinine soluble salts possess an extremely bitter taste, that may have a perplexing problem especially to children. That is why one of the most common combinations for oral administration is a slightly soluble quinine salicylate salt. It is known that now quinine is used in the absence of artemisin combination therapies (ARTs) to treat CQ resistant (CQR) P. falciparum malaria. Although the precise mechanism of the antimalarial activity of quinine is not completely understood, it can act via the inhibition on nucleic acid synthesis, on protein synthesis, and on glycolysis in Plasmodium falciparum, and also drug can affect via the binding with hemazoin in parasitized erythrocytes.

Potassium salicylate is the potassium salt of salicylic acid. Potassium Salicylate is a cosmetic biocide and preservative, not currently in use. Potassium salicylate was used for the treatment of melasma. Potassium salicylate is considered safe as used when formulated to avoid irritation and when formulated to avoid increasing sun sensitivity, or, when increased sun sensitivity would be expected, directions for use include the daily use of sun protection.

Mercuric salicylate is a white, odorless, tasteless powder containing about 59 percent of mercury. It was prescribed for external use, internally and by intramuscular injections. Mercuric salicylate was recommended as a syphilitic remedy. Drug produces signs of mercurialization in the patients.

Dipropylene glycol salicylate is a derivative of salicylic acid. It is used in the cosmetic industry as an emollient (to soften the skin), surfactant, tonic, skin conditioning, and viscosity controlling agent. Dipropylene glycol salicylate is also used as ultraviolet (UV) absorber in sunscreens, pharmaceuticals, polymers, dyes and UV screening agent in protective coatings.

Calcium salicylate is the calcium salt of salicylic acid. The anti-cancer effectiveness of calcium salicylate has been investigated on human HT-1080 fibrosarcoma cell lines. Low calcium salicylate concentrations did not retard tumor growth progression significantly but its cytotoxic characteristics were proven to be prominent by various morphological and immunocytological techniques - approximately 25% apoptosis after treatment with calcium salicylate. This compound up-regulated the expression of p53, p21 and Bax, and down-regulated Bcl-2 in HT-1080 cells. In addition, calcium salicylate is used in root canal filling material development.