The makers of Brazilian Blowout, a beauty product intended to give users straight, frizz-free hair, have been warned by the FDA to stop misleading consumers and start disclosing its formaldehyde content.

The FDA conducted a sample analysis and found that Brazilian Blowout contains methylene glycol, which is the liquid form of formaldehyde, a harmful substance.

Since bottles of Brazilian Blowout say it does not contain formaldehyde, the FDA sent a warning letter to Mike Brady, the CEO of GIB LLC, which makes the product.

Brazilian Blowout is misbranded because its label and labeling (including instructions for use) makes misleading statements regarding the product's ingredients and fails to reveal material facts with respect to consequences that may result from the use of the product, the letter stated.

Brady maintains that Brazilian Blowout is within the safety limits of the Occupational Health and Safety Administration (OSHA).

When you heat up methylene glycol, trace amounts of formaldehyde are released into the air, Brady said, ABC News reported. But OSHA has very clear guidelines on formaldehyde emissions, and our product has never exceeded those guidelines ever.