Yes, you can use collagen and salicylic acid together in your skincare routine. Collagen is a protein that helps to maintain the structure and elasticity of the skin. It is commonly used in skincare products to promote firmness and reduce the appearance of wrinkles.

Salicylic acid, on the other hand, is a beta hydroxy acid (BHA) that is known for its exfoliating properties. It helps to unclog pores, reduce inflammation, and treat acne.

When used together, collagen and salicylic acid can complement each other's benefits. Salicylic acid can help to exfoliate the skin, allowing collagen to penetrate more effectively. This can enhance the absorption and efficacy of collagen in promoting skin firmness and elasticity.

However, it is important to note that everyone's skin is different, and some individuals may experience sensitivity or irritation when using salicylic acid. If you have sensitive skin or are unsure about combining these ingredients, it is always best to consult with a dermatologist or skincare professional before incorporating them into your routine.