Yes, you can mix collagen and BHA (beta hydroxy acid) in your skincare routine. Collagen is a protein that helps to support the structure and elasticity of the skin. BHA, on the other hand, is an exfoliating ingredient that helps to unclog pores and improve skin texture.

When using these two ingredients together, it is important to consider the pH levels of the products you are using. BHA is most effective at a low pH, typically around 3-4, while collagen products may have a higher pH. If the pH of the collagen product is too high, it may reduce the efficacy of the BHA.

To ensure compatibility, you can apply the BHA product first, allowing it to penetrate and exfoliate the skin. After a few minutes, you can then apply the collagen product. This way, you can still benefit from the exfoliating properties of the BHA while also providing your skin with the nourishing effects of collagen.

It is always a good idea to patch test new products and observe how your skin reacts to the combination of ingredients. Additionally, if you have sensitive skin or any concerns, consulting with a dermatologist is recommended.