Basically, it is considered as the safest oil over the world. But there is no product found without side effects. All products have different side effects. Argan oil also has its own. It may not be suitable for all skin types. This oil may produce an allergic reaction called contact dermatitis. Similarly, it may cause skin rashes, scalp rashes, skin infection, and scalp infections too. The oil also affects your blood clotting and interact with anticoagulants. Not only skin and scalp, but it also affects your body health. So, before consuming and using this vegetable and cosmetic-grade oil, consult your doctor.