Keratin Hair Treatment is suitable for all hair types, including chemically treated hair. However, it's important to note that the treatment is not recommended for pregnant or breastfeeding women due to the formaldehyde used in some Keratin Hair Treatments. Alternatively, At Highlight Salon, we also use formaldehyde-free Keratin Hair Treatment solutions from GK Hair (Global Keratin) to ensure the safety and comfort of our customers. We also recommend consulting with our expert hair care professionals to determine which product brand Keratin Hair Treatment is right for you.