However, the use of parabens is now controversial due to their alleged relation to health concerns. Parabens were so popular because of their gentle, non-sensitizing, and highly effective in comparison to other preservatives. Parabens have up until recently been the most widely used group of preservatives in skincare and cosmetic products. If parabens are absorbed through the skin, the human body can quickly metabolize them to PHBA and eliminate them.

The parabens used in cosmetics are identical to those found in nature. Parabens are found in plants in the form of p-hydroxybenzoic acid (PHBA), a chemical that breaks down to become parabens to protect the plant. Propylparaben naturally occurs in some fruit and vegetable products, such as barley, flaxseed, and grapes. This is important for ensuring the safety of a product. Preservatives like parabens are designed to reduce the likelihood that bacteria and molds can grow in your product. Microbial contamination can occur from exposure to bacteria and molds in the air and general use of the product from your hands. Propylparaben is used to extend the shelf-life of a product life by preventing microbial contamination. Other common parabens include methylparaben, butylparaben, isobutylparaben, and ethylparaben.

Propylparaben is classed as a paraben, a group of preservatives with slightly different functions and anti-microbial activity based on their size. Propylparaben is a preservative used in skincare and cosmetic formulations.

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