This is a bit of a gray area. Generally speaking, using hyaluronic acid (the active ingredient in Juvederm) is considered safe during breastfeeding because it doesn't usually enter the bloodstream. However, it's a different story when it comes to injections.
Although hyaluronic acid is a naturally occurring substance in the body, the safety of injecting it while breastfeeding isn't fully understood yet. This is because there haven't been enough studies conducted to provide a definitive answer. It's one of those "better safe than sorry" situations.
If you're considering Juvederm, it's always a good idea to have a chat with your healthcare provider. But until we have more research, the golden rule is to tread carefully and prioritize the health of you and your little one.