WASHINGTON, Nov 28 (Reuters) - The U.S. Food and Drug Administration defended the safety of infant formula sold in the United States on Friday despite tests that found the chemical melamine and a related byproduct in two brands.

FDA tests found "very low levels" of the industrial chemical melamine in Nestle's <NESN.VX> Good Start Supreme with Iron formula, said Stephen Sundlof, director of the FDA's Center for Food Safety and Applied Nutrition.

It also found low levels of cyanuric acid, a byproduct of melamine, in Mead Johnson's Enfamil Lipil with Iron, Sundlof said. Mead Johnson is a unit of Bristol-Myers Squibb <BMY.N>.

Those findings "do not raise public health concerns," Sundlof told a conference call. "The domestic supply of infant formula is safe." (Reporting by Susan Heavey)

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