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Description
These systems discern the environmental stimuli signals, such as variations in pH, ionic strength, redox conditions, and the presence of specific proteins or enzymes, and consequently decide on the release of drugs

Retinol and retinoids (both are vitamin A derivatives) are often mistaken as ingredients solely for mature skin due to their ability to reduce the look of fine lines and wrinkles, tackle age and damage-related discolourations and promote firmer skin (1)

Rama Rao and Norenberg, 2004

Javaid et al., 2021
