Is it safe to take l-arginine while pregnant or breastfeeding?

It's probably safe: L-arginine is a naturally occurring Amino Acid (one of the building blocks of protein) and is found in lots of food. Taking moderate amounts is probably ok. But there doesn't seem to be any proven benefit to take extra l-arginine. Since anything beyond a healthy and balanced diet has the potent for harm, supplements and medicine should only be taken if recommended by your trusted health provide.

PREGNANCY: Yes, it is safe to take it during pregnancy and breastfeeding.