truskin vitamin c-plus super serum, anti aging anti-wrinkle facial serum with niacinamide, retinol, hyaluronic acid, and salicylic acid, 1 oz truskin naturals <p><b>always -</b> perform a patch test on a small test area of skin, such as the back of your neck or hand, 24 hours before applying the product to your face to ensure the formula is compatible with your skin. <p>as when adding any skin care product to your routine, it’s important to make sure the formula is a good fit for you. <p><b>manufacturer's 100% hassle-free guarantee</b> <p>if you’re not happy for any reason, simply contact truskin naturals and they will give you a full refund, no questions asked and no need to return the bottle.