They’re often called “prenatal vitamins,” but these supplements supply much more. In addition to serving as a back-up for any nutritional gaps in your diet, a prenatal supplement approved by your doctor can help reduce risk for some birth defects, preterm birth and low birth weight baby, while helping you to maintain your own health during pregnancy.
Tell your doctor about any supplements you're taking, even if they're natural. That way, your doctor can check on any potential side effects or interactions with medications or foods. He or she can let you know if the supplement might increase your risk.
The FDA does not regulate supplements. However, it has approved an injectable branched-chain amino acid.