Formaldehyde is commonly used as a preservative in cosmetics and hair care products. It has been known to cause allergic reactions and rashes when in contact with skin. Although concentrations of formaldehyde in personal care products is generally found in low doses, daily product use can contain enough formaldehyde to trigger a reaction in people with formaldehyde sensitivities. Formaldehyde is easily absorbed through the skin and eyes, it can cause severe irritation and burns in skin and lead to loss of vision.Formaldehyde is considered a human carcinogen by the United States National Toxicology Program and the International Agency for Research on Cancer