Some toxins to watch out for are in our food, others in our personal care products, and some are in both. Methylene glycol is found in our personal care products. Why don’t you want Methylene glycol? Cancer Risk: Frequent use of products containing methylene glycol, such as keratin treatments, is linked to an increased risk of uterine, ovarian, and breast cancers. Respiratory Harm: Inhalation of vapors during heat-activated hair treatments can cause coughing, wheezing, chest pain, and long-term asthma. Skin and Eye Irritation: It is a strong sensitizer that can cause severe rashes, allergic contact dermatitis, and eye injuries.