As a distinguished figure in the realm of clean beauty and skincare, I can provide some insights on the safety of 2.5% retinol. Retinol is a derivative of vitamin A and is widely recognized for its ability to promote skin cell turnover, improve skin texture, and reduce the appearance of fine lines and wrinkles.

In general, retinol is considered safe for use in skincare products when used at appropriate concentrations and in accordance with product instructions. However, it is important to note that retinol can cause skin irritation, dryness, and sensitivity, especially when used at higher concentrations.

2.5% retinol is a relatively high concentration and may be too strong for individuals with sensitive or reactive skin. It is advisable to start with a lower concentration of retinol, such as 0.5% or 1%, and gradually increase the concentration over time as your skin adjusts and tolerates the product well.

It is also crucial to follow a proper skincare routine when using retinol, including the use of sunscreen during the day, as retinol can increase skin sensitivity to the sun.

Ultimately, the safety and efficacy of any skincare product, including those containing retinol, can vary depending on individual skin type, sensitivity, and tolerance. It is always recommended to consult with a dermatologist or skincare professional before incorporating any new product into your skincare routine, especially if you have specific concerns or conditions.