Short answer: hyaluronic acid is generally considered safe to use during pregnancy and breastfeeding. Here is the reasoning — and how to confirm it for your exact product.
It is a humectant that naturally occurs in the body and holds moisture in the skin. In serums and moisturisers it hydrates and plumps, and it is a common pregnancy-friendly swap for harsher actives.
Topical hyaluronic acid has very low skin absorption and no known link to pregnancy complications, which is why dermatology guidance generally treats it as safe. As always, confirm with your provider for your situation.
The real risks in skincare are actives like retinoids and high-dose salicylic acid. The catch is that products mix ingredients — so a "hyaluronic acid serum" can still contain something to avoid. Scanning the full label is what makes the read reliable.