The paper presents the results of the study on the involvement of four amino acids (glycine, leucine, alanine and phenylalanine) in the oxidation processes activated by solar radiation, namely UV radiation. Research was carried out to determine whether these amino acids could perform, in addition to the cosmetic care action, the protection, prevention and combating of oxidation processes activated by solar radiation, namely, those with the participation of OH radicals. The study used the method of competing acceptors and a radiation source that simulates the solar spectrum at the earth’s surface. It has been established that amino acids participate in the regeneration processes of the active form of oxygen, OH radicals, so they cannot be recommended as multi-action ingredients in cosmetic formulas.