June 15, 2010 -- The FDA is warning parents and caregivers of infants that some liquid vitamin D supplement products sold with droppers could allow excessive doses to be given to babies, which could be harmful.
The FDA says some droppers that come with the vitamin D liquid could hold more than the 400 international units (IU) a day recommended by the American Academy of Pediatrics.
"It is important that infants not get more than the recommended daily amount of vitamin D," Linda M. Katz, MD, MPH, of the FDA, says in a news release. "Parents and caregivers should only use the dropper that comes with the vitamin supplement purchased."
Excessive vitamin D can cause nausea and vomiting, loss of appetite, excessive thirst, frequent urination, constipation, abdominal pain, muscle weakness, muscle and joint aches, confusion, and fatigue and even cause serious damage to kidneys, the FDA says.
Vitamin D in proper doses is necessary for infant development, promoting calcium absorption in the gut and strong bone development. Vitamin D supplements are recommended for some infants, especially those who are breastfed, because deficiency can lead to bone problems, such as thinning, soft, and misshapen bones such as seen in the condition known as rickets.
The FDA told manufacturers of liquid vitamin D supplements that droppers accompanying the products should be clearly and accurately marked for 400 IU. For products meant for infants, droppers should hold no more than 400 IU, the FDA said.
Joshua M. Sharfstein, MD, principal deputy commissioner of FDA, said in a letter to manufacturers that the agency has learned in the past several months that there has been an increase in the number of liquid vitamin D supplements and called on the industry to "provide the necessary safeguards to ensure that infants using these products" to prevent unsafe amounts from being given.